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  1. 184
      subjects/audits-at-home.en.md
  2. 24
      subjects/biggie-smalls.en.md
  3. 66
      subjects/change.en.md
  4. 26
      subjects/circular.en.md
  5. 42
      subjects/currify.en.md
  6. 96
      subjects/curry-entries.en.md
  7. 54
      subjects/cut-corners.en.md
  8. 38
      subjects/date-is.en.md
  9. 24
      subjects/debounce.en.md
  10. 18
      subjects/deep-copy.en.md
  11. 56
      subjects/filter.en.md
  12. 60
      subjects/find-expression.en.md
  13. 38
      subjects/flat.en.md
  14. 52
      subjects/flow.en.md
  15. 40
      subjects/for-each.en.md
  16. 56
      subjects/get-json.en.md
  17. 90
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  18. 32
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  22. 22
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  23. 42
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  26. 4
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184
subjects/audits-at-home.en.md
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## How to do an audit from home
### Introduction
A little reminder first,
Audits, as we have told you many times, are an essential part of leveling up and truly acquiring your skills
and knowledge.
Normally, they must be done with your physical presence.
The idea is that they encourage the exchange between the auditors and the members of the group.
If the project fails, the whole group will learn why. And then after all your audits are done you will retry.
During all those extra audits, you, as a group, will discuss about your failures with the auditors.
If the project succeed, you will be an inspiration for the auditors.
In both of those cases you will learn or you will teach. The roles will keep reversing almost every time.
It is, ultimaly, those interactions that are essential for really learning;
To give and receive feedback, but also to see what you really know as an individual and what you do not.
This will increase your capacity to solve problems and your capacity to adapt, which is one of the most important
skill of a good programmer.
Today, once again, we must adapt...
Knowledge is important but not as essential as health.
We really wish all of you to stay safe and healthy at home.
This is why we created a little guideline in how to conduct your audit from home.
There is a video here : [youtube.com/watch?v=J8g8P-IJLJw](https://www.youtube.com/watch?v=J8g8P-IJLJw)
But we are also going to summarize the process.
So here we go.
### Prerequisites for the team captain and the auditor
- A program to communicate and livestream installed (like Discord [https://discordapp.com/](https://discordapp.com/) )
- A program to allows the auditor to take charge of the computer
of the team captain installed (like teamViewer [teamviewer.com/](https://www.teamviewer.com/) )
### Prerequisite for the team captain
The team captain must communicate :
- The contact of his or her teammates to the auditor
- The git repository of the project to be reviewed (the link must be public or accessible for the auditor)
- The team captain must be logged in in his or her session to allow the auditor to start its audit
### Prerequisite for the auditor
- The auditor will need to create the group on the communication program
- The auditor will need to download the project repository
- The auditor, if the internet bandwith allows it, will livestream the process
### Instructions
1. Let the auditor establish the communication with the group members and the captain.
2. Once all prequisites are done from the team captain and the auditor let the audit begin.
3. If possible, the auditor starts the stream.
4. The captain, after checking that the login is done on his or her computer, allows the auditor
to take control of its computer (with teamViewer for example)
5. The auditor now has the control to start the audit on the computer of the captain.
The organization of the windows by the auditor might be the tricky part. We suggest
to see how we did it in the video if you find it difficult.
6. The auditor conducts the audit, if the auditor can not live stream its audits, he or she
will then explain by voice (or writing in the chat) what he or she is doing to the rest of the group.
7. The audit is conducted until all questions are validated or until a mistake is made.
8. If a mistake is made the auditor can copy paste the commands that detected the mistakes.
9. The group discusses as much as needed until the audit is completed.
10. Once the audit is completed, all programs can be closed up. Say bye and thank you for your time and make the
necessary conclusions among the members of the group.
### Conclusion
Thank you for reading until the end. Stay safe.
### Bonus
Did you know that there is a nice `Live Share` extension on `vscode`?
This allows to do remote group programming easily. It might be an alternative solution
to the livestream if necessary.
Try it out!
Stay safe everyone! Happy coding!
## How to do an audit from home
### Introduction
A little reminder first,
Audits, as we have told you many times, are an essential part of leveling up and truly acquiring your skills
and knowledge.
Normally, they must be done with your physical presence.
The idea is that they encourage the exchange between the auditors and the members of the group.
If the project fails, the whole group will learn why. And then after all your audits are done you will retry.
During all those extra audits, you, as a group, will discuss about your failures with the auditors.
If the project succeed, you will be an inspiration for the auditors.
In both of those cases you will learn or you will teach. The roles will keep reversing almost every time.
It is, ultimaly, those interactions that are essential for really learning;
To give and receive feedback, but also to see what you really know as an individual and what you do not.
This will increase your capacity to solve problems and your capacity to adapt, which is one of the most important
skill of a good programmer.
Today, once again, we must adapt...
Knowledge is important but not as essential as health.
We really wish all of you to stay safe and healthy at home.
This is why we created a little guideline in how to conduct your audit from home.
There is a video here : [youtube.com/watch?v=J8g8P-IJLJw](https://www.youtube.com/watch?v=J8g8P-IJLJw)
But we are also going to summarize the process.
So here we go.
### Prerequisites for the team captain and the auditor
- A program to communicate and livestream installed (like Discord [discordapp.com](https://discordapp.com/) )
- A program to allows the auditor to take charge of the computer
of the team captain installed (like teamViewer [teamviewer.com](https://www.teamviewer.com/) )
### Prerequisite for the team captain
The team captain must communicate :
- The contact of his or her teammates to the auditor
- The git repository of the project to be reviewed (the link must be public or accessible for the auditor)
- The team captain must be logged in in his or her session to allow the auditor to start its audit
### Prerequisite for the auditor
- The auditor will need to create the group on the communication program
- The auditor will need to download the project repository
- The auditor, if the internet bandwith allows it, will livestream the process
### Instructions
1. Let the auditor establish the communication with the group members and the captain.
2. Once all prequisites are done from the team captain and the auditor let the audit begin.
3. If possible, the auditor starts the stream.
4. The captain, after checking that the login is done on his or her computer, allows the auditor
to take control of its computer (with teamViewer for example)
5. The auditor now has the control to start the audit on the computer of the captain.
The organization of the windows by the auditor might be the tricky part. We suggest
to see how we did it in the video if you find it difficult.
6. The auditor conducts the audit, if the auditor can not live stream its audits, he or she
will then explain by voice (or writing in the chat) what he or she is doing to the rest of the group.
7. The audit is conducted until all questions are validated or until a mistake is made.
8. If a mistake is made the auditor can copy paste the commands that detected the mistakes.
9. The group discusses as much as needed until the audit is completed.
10. Once the audit is completed, all programs can be closed up. Say bye and thank you for your time and make the
necessary conclusions among the members of the group.
### Conclusion
Thank you for reading until the end. Stay safe.
### Bonus
Did you know that there is a nice `Live Share` extension on `vscode`?
This allows to do remote group programming easily. It might be an alternative solution
to the livestream if necessary.
Try it out!
Stay safe everyone! Happy coding!

24
subjects/biggie-smalls.en.md
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## Biggie Smalls
### Instructions
Create 2 variables
- `smalls` with the smallest possible number value
- `biggie` with the greatest possible number value
### Notions
- [https://devdocs.io/javascript-number/](https://devdocs.io/javascript-number/)
## Biggie Smalls
### Instructions
Create 2 variables
- `smalls` with the smallest possible `number` value
- `biggie` with the greatest possible `number` value
### Notions
- [devdocs.io/javascript-number](https://devdocs.io/javascript-number/)

66
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## Change
### Instructions
Create 2 functions:
- `get`: a function that takes a key and return the corresponding
value from the sourceObject
- `set`: a function that takes a key and a value update the
value for the corresponding property of the sourceObject
and return the set value
### Notions
- [https://nan-academy.github.io/js-training/examples/functions.js](https://nan-academy.github.io/js-training/examples/functions.js)
- [https://nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [https://nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)
- [https://nan-academy.github.io/js-training/examples/set.js](https://nan-academy.github.io/js-training/examples/set.js)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
const sourceObject = {
num: 42,
bool: true,
str: 'some text',
log: console.log,
}
```
## Change
### Instructions
Create 2 functions:
- `get`: a function that takes a key and return the corresponding
value from the sourceObject
- `set`: a function that takes a key and a value update the
value for the corresponding property of the sourceObject
and return the set value
### Notions
- [nan-academy.github.io/js-training/examples/functions.js](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)
- [nan-academy.github.io/js-training/examples/set.js](https://nan-academy.github.io/js-training/examples/set.js)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
const sourceObject = {
num: 42,
bool: true,
str: 'some text',
log: console.log,
}
```

26
subjects/circular.en.md
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## Circular
### Instructions
Create an object named `circular` that has a property named `circular` with
itself as the value
### Notions
- [https://nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [https://nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)
- [https://nan-academy.github.io/js-training/examples/set.js](https://nan-academy.github.io/js-training/examples/set.js)
## Circular
### Instructions
Create an object named `circular` that has a property named `circular` with
itself as the value
### Notions
- [nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)
- [nan-academy.github.io/js-training/examples/set.js](https://nan-academy.github.io/js-training/examples/set.js)

42
subjects/currify.en.md
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## Currify
### Instructions
Create the function `currify` that will curry any functions put as argument.
example:
```js
const mult2 = (el1,el2) => el1 * el2
console.log(mult2(2,2)) // result epected 4
const mult2Curried = currify(mult2)
console.log(mult2Curried(2)(2)) // result expected 4
// (same result, with a function that has technically only one argument)
```
### Notions
- [https://stackoverflow.com/questions/36314/what-is-currying](https://stackoverflow.com/questions/36314/what-is-currying)
## Currify
### Instructions
Create the function `currify` that will curry any functions put as argument.
example:
```js
const mult2 = (el1,el2) => el1 * el2
console.log(mult2(2,2)) // result epected 4
const mult2Curried = currify(mult2)
console.log(mult2Curried(2)(2)) // result expected 4
// (same result, with a function that has technically only one argument)
```
### Notions
- [stackoverflow.com/questions/36314/what-is-currying](https://stackoverflow.com/questions/36314/what-is-currying)

96
subjects/curry-entries.en.md
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## Curry Entries
### Instructions
This exercise consists in creating curry functions to apply in the objects
entries.
You will have to create the following curry functions:
- `defaultCurry` that will curry two objects in witch the second object must
be the default object and returns a new object with the modifications applied
by the first object
- `mapCurry` that replicate the function `.map`
- `reduceCurry` that replicate the function `.reduce`
- `filterCurry` that replicate the function `.filter`
You will also have to create for each curry function the following:
- `reduceScore` that will return the total value of the scores
of the persons who use the force
- `filterForce` that will return the force users with `shootingScores`
equal or higher than 80
- `mapAverage` that will return a new object with the propriety `averageScore`
that is the averages of the scores for each person
### Notions
- [https://devdocs.io/javascript/global_objects/array/filter](https://devdocs.io/javascript/global_objects/array/filter)
- [https://devdocs.io/javascript/global_objects/array/map](https://devdocs.io/javascript/global_objects/array/map)
- [https://devdocs.io/javascript/global_objects/array/reduce](https://devdocs.io/javascript/global_objects/array/reduce)
- [https://devdocs.io/javascript/global_objects/object/entries](https://devdocs.io/javascript/global_objects/object/entries)
- [https://devdocs.io/javascript/global_objects/object/fromentries](https://devdocs.io/javascript/global_objects/object/fromentries)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
// prettier-ignore
const personnel = {
lukeSkywalker: { id: 5, pilotingScore: 98, shootingScore: 56, isForceUser: true },
sabineWren: { id: 82, pilotingScore: 73, shootingScore: 99, isForceUser: false },
zebOrellios: { id: 22, pilotingScore: 20, shootingScore: 59, isForceUser: false },
ezraBridger: { id: 15, pilotingScore: 43, shootingScore: 67, isForceUser: true },
calebDume: { id: 11, pilotingScore: 71, shootingScore: 85, isForceUser: true },
}
```
## Curry Entries
### Instructions
This exercise consists in creating curry functions to apply in the objects
entries.
You will have to create the following curry functions:
- `defaultCurry` that will curry two objects in witch the second object must
be the default object and returns a new object with the modifications applied
by the first object
- `mapCurry` that replicate the function `.map`
- `reduceCurry` that replicate the function `.reduce`
- `filterCurry` that replicate the function `.filter`
You will also have to create for each curry function the following:
- `reduceScore` that will return the total value of the scores
of the persons who use the force
- `filterForce` that will return the force users with `shootingScores`
equal or higher than 80
- `mapAverage` that will return a new object with the propriety `averageScore`
that is the averages of the scores for each person
### Notions
- [devdocs.io/javascript/global_objects/array/filter](https://devdocs.io/javascript/global_objects/array/filter)
- [devdocs.io/javascript/global_objects/array/map](https://devdocs.io/javascript/global_objects/array/map)
- [devdocs.io/javascript/global_objects/array/reduce](https://devdocs.io/javascript/global_objects/array/reduce)
- [devdocs.io/javascript/global_objects/object/entries](https://devdocs.io/javascript/global_objects/object/entries)
- [devdocs.io/javascript/global_objects/object/fromentries](https://devdocs.io/javascript/global_objects/object/fromentries)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
// prettier-ignore
const personnel = {
lukeSkywalker: { id: 5, pilotingScore: 98, shootingScore: 56, isForceUser: true },
sabineWren: { id: 82, pilotingScore: 73, shootingScore: 99, isForceUser: false },
zebOrellios: { id: 22, pilotingScore: 20, shootingScore: 59, isForceUser: false },
ezraBridger: { id: 15, pilotingScore: 43, shootingScore: 67, isForceUser: true },
calebDume: { id: 11, pilotingScore: 71, shootingScore: 85, isForceUser: true },
}
```

54
subjects/cut-corners.en.md
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## Cut Corners
### Instructions
Create a function for each rounding math functions:
- round (like `Math.round`)
- ceil (like `Math.ceil`)
- floor (like `Math.floor`)
- trunc (like `Math.trunc`)
Some restrictions apply:
- You may not use strings conversion to do it
- No bitwise operator
### Notions
- [https://devdocs.io/javascript/global_objects/math](https://devdocs.io/javascript/global_objects/math)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Math.round = Math.ceil = Math.floor = Math.trunc = undefined
```
## Cut Corners
### Instructions
Create a function for each rounding math functions:
- round (like `Math.round`)
- ceil (like `Math.ceil`)
- floor (like `Math.floor`)
- trunc (like `Math.trunc`)
Some restrictions apply:
- You may not use strings conversion to do it
- No bitwise operator
### Notions
- [devdocs.io/javascript/global_objects/math](https://devdocs.io/javascript/global_objects/math)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Math.round = Math.ceil = Math.floor = Math.trunc = undefined
```

38
subjects/date-is.en.md
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## Date Is
### Instructions
Create the following functions:
- `isValid`, this function must return false if its an Invalid Date
- `isAfter`, this function will receive two dates and return true if the first date is bigger then the second date
- `isBefore`, this function will receive two dates and return true if the first date is lesser then the second date
- `isFuture`, will return true if the date given as parameter is higher then the present date
- `isPast`, will return true if the date given as parameter less then the present date
### Notions
- [https://date-fns.org/v2.14.0/docs/isValid](https://date-fns.org/v2.14.0/docs/isValid)
- [https://date-fns.org/v2.14.0/docs/isAfter](https://date-fns.org/v2.14.0/docs/isAfter)
- [https://date-fns.org/v2.14.0/docs/isBefore](https://date-fns.org/v2.14.0/docs/isBefore)
- [https://date-fns.org/v2.14.0/docs/isFuture](https://date-fns.org/v2.14.0/docs/isFuture)
- [https://date-fns.org/v2.14.0/docs/isPast](https://date-fns.org/v2.14.0/docs/isPast)
## Date Is
### Instructions
Create the following functions:
- `isValid`, this function must return false if its an Invalid Date
- `isAfter`, this function will receive two dates and return true if the first date is bigger then the second date
- `isBefore`, this function will receive two dates and return true if the first date is lesser then the second date
- `isFuture`, will return true if the date given as parameter is higher then the present date
- `isPast`, will return true if the date given as parameter less then the present date
### Notions
- [date-fns.org/v2.14.0/docs/isValid](https://date-fns.org/v2.14.0/docs/isValid)
- [date-fns.org/v2.14.0/docs/isAfter](https://date-fns.org/v2.14.0/docs/isAfter)
- [date-fns.org/v2.14.0/docs/isBefore](https://date-fns.org/v2.14.0/docs/isBefore)
- [date-fns.org/v2.14.0/docs/isFuture](https://date-fns.org/v2.14.0/docs/isFuture)
- [date-fns.org/v2.14.0/docs/isPast](https://date-fns.org/v2.14.0/docs/isPast)

24
subjects/debounce.en.md
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## Debounce
### Instructions
Create two functions that will work like `_.debounce` from lodash
- `debounce`, this function doesn't need to take care of the options
- `opDebounce`, this function will take care of the `leading` options
### Notions
- [https://lodash.com/docs/4.17.15#debounce](https://lodash.com/docs/4.17.15#debounce)
## Debounce
### Instructions
Create two functions that will work like `_.debounce` from lodash
- `debounce`, this function doesn't need to take care of the options
- `opDebounce`, this function will take care of the `leading` options
### Notions
- [lodash.com/docs/4.17.15#debounce](https://lodash.com/docs/4.17.15#debounce)

18
subjects/deep-copy.en.md
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## Deep Copy
### Instructions
Create a function called `deepCopy` that copy objects and arrays recursively.
### Notions
- [https://devdocs.io/javascript-object/](https://devdocs.io/javascript-object/)
## Deep Copy
### Instructions
Create a function called `deepCopy` that copy objects and arrays recursively.
### Notions
- [devdocs.io/javascript-object](https://devdocs.io/javascript-object/)

56
subjects/filter.en.md
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## Filter
### Instructions
- Create a `filter` function that takes an array as first argument, a function as second,
and that works like the method [].filter
- Create a `reject` function that takes an array as first argument, a function as second,
and that works like the reject function from lodash.
- Create a `partition` function that takes an array as first argument, a function as second,
and that works like the partition function from lodash.
### Notions
- [https://devdocs.io/javascript/global_objects/array/filter](https://devdocs.io/javascript/global_objects/array/filter)
- [https://lodash.com/docs/4.17.15#reject](https://lodash.com/docs/4.17.15#reject)
- [https://lodash.com/docs/4.17.15#partition](https://lodash.com/docs/4.17.15#partition)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Array.prototype.filter = undefined
```
## Filter
### Instructions
- Create a `filter` function that takes an array as first argument, a function as second,
and that works like the method [].filter
- Create a `reject` function that takes an array as first argument, a function as second,
and that works like the reject function from lodash.
- Create a `partition` function that takes an array as first argument, a function as second,
and that works like the partition function from lodash.
### Notions
- [devdocs.io/javascript/global_objects/array/filter](https://devdocs.io/javascript/global_objects/array/filter)
- [lodash.com/docs/4.17.15#reject](https://lodash.com/docs/4.17.15#reject)
- [lodash.com/docs/4.17.15#partition](https://lodash.com/docs/4.17.15#partition)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Array.prototype.filter = undefined
```

60
subjects/find-expression.en.md
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## Find Expression
### Instructions
Create a function called `findExpression` that takes a number as parameter and returns a string
- It will be given two constant variable `add4` and `mul2`
- Your goal is to try to find a sequence, starting from the number 1, and repeatedly either adding 4 or multiplying 2
that produces the number given has parameter.
For example, the number 8 you must first multiplying by 2 twice and then add 4.
It will look something like this `1 *2 *2 +4`
- If the number can not be reached you should return `undefined`
### Notions
- [https://nan-academy.github.io/js-training/examples/loops.js](https://nan-academy.github.io/js-training/examples/loops.js)
- [https://nan-academy.github.io/js-training/examples/recursion.js](https://nan-academy.github.io/js-training/examples/recursion.js)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
const add4 = '+4'
const mul2 = '*2'
```
## Find Expression
### Instructions
Create a function called `findExpression` that takes a number as parameter and returns a string
- It will be given two constant variable `add4` and `mul2`
- Your goal is to try to find a sequence, starting from the number 1, and repeatedly either adding 4 or multiplying 2
that produces the number given has parameter.
For example, the number 8 you must first multiplying by 2 twice and then add 4.
It will look something like this `1 *2 *2 +4`
- If the number can not be reached you should return `undefined`
### Notions
- [nan-academy.github.io/js-training/examples/loops.js](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion.js](https://nan-academy.github.io/js-training/examples/recursion.js)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
const add4 = '+4'
const mul2 = '*2'
```

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## Flat
### Instructions
Create the `flat` functions that works like the `.flat` array method
### Notions
- [https://devdocs.io/javascript/global_objects/array/flat](https://devdocs.io/javascript/global_objects/array/flat)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Array.prototype.flat = undefined
```
## Flat
### Instructions
Create the `flat` functions that works like the `.flat` array method
### Notions
- [devdocs.io/javascript/global_objects/array/flat](https://devdocs.io/javascript/global_objects/array/flat)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Array.prototype.flat = undefined
```

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## Flow
### Instructions
Create the function `flow` that will works as the _.flow([funcs])
from lodash.
Example
``` js
const square = nbr => nbr * nbr
const add2Numbers = (nbr1, nbr2) => nbr1 + nbr2
const flowedFunctions = flow([add2numbers, square])
flowedFunctions(2, 3)
```
returns
```js
25
```
### Notions
- [https://lodash.com/docs/4.17.15#flow](https://lodash.com/docs/4.17.15#flow)
## Flow
### Instructions
Create the function `flow` that will works as the \_.flow([funcs])
from lodash.
### Example
``` js
const square = nbr => nbr * nbr
const add2Numbers = (nbr1, nbr2) => nbr1 + nbr2
const flowedFunctions = flow([add2numbers, square])
flowedFunctions(2, 3) // -> 25
```
### Notions
- [lodash.com/docs/4.17.15#flow](https://lodash.com/docs/4.17.15#flow)

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## For Each
### Instructions
Create a `forEach` function that takes an array as first argument, a function as second,
and that works like the method .forEach
### Notions
- [https://devdocs.io/javascript/global_objects/array/foreach](https://devdocs.io/javascript/global_objects/array/foreach)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Array.prototype.forEach = undefined
```
## For Each
### Instructions
Create a `forEach` function that takes an array as first argument, a function as second,
and that works like the method .forEach
### Notions
- [devdocs.io/javascript/global_objects/array/foreach](https://devdocs.io/javascript/global_objects/array/foreach)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Array.prototype.forEach = undefined
```

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## Get Json
### Instructions
In this exercise, we will focus on building complex async flows with promises.
Create a `getJSON` function that takes 2 parameters:
- `path`, that will be the url called by your function
- `params` *optional*, that will be the search parameters appended to your url
`getJSON` must construct a valid url with the `path` and stringified `params`
and call `fetch` with it.
If the response is not ok, your function must throw an error using
the response status message.
The response body must then be read and parsed from json.
The parsed object contains one of those 2 properties:
- `"data"` the actual data to return
- `"error"` the error message to throw
### Notions
- [https://nan-academy.github.io/js-training/examples/promise.js](https://nan-academy.github.io/js-training/examples/promise.js)
- [https://devdocs.io/dom/fetch_api/using_fetch](https://devdocs.io/dom/fetch_api/using_fetch)
- [https://devdocs.io/dom/urlsearchparams](https://devdocs.io/dom/urlsearchparams)
- [https://devdocs.io/javascript/global_objects/json](https://devdocs.io/javascript/global_objects/json)
## Get Json
### Instructions
In this exercise, we will focus on building complex async flows with promises.
Create a `getJSON` function that takes 2 parameters:
- `path`, that will be the url called by your function
- `params` *optional*, that will be the search parameters appended to your url
`getJSON` must construct a valid url with the `path` and stringified `params`
and call `fetch` with it.
If the response is not ok, your function must throw an error using
the response status message.
The response body must then be read and parsed from json.
The parsed object contains one of those 2 properties:
- `"data"` the actual data to return
- `"error"` the error message to throw
### Notions
- [nan-academy.github.io/js-training/examples/promise.js](https://nan-academy.github.io/js-training/examples/promise.js)
- [devdocs.io/dom/fetch_api/using_fetch](https://devdocs.io/dom/fetch_api/using_fetch)
- [devdocs.io/dom/urlsearchparams](https://devdocs.io/dom/urlsearchparams)
- [devdocs.io/javascript/global_objects/json](https://devdocs.io/javascript/global_objects/json)

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## Gougle Search
### Instructions
Create the `queryServers` function, that takes 2 arguments:
- `serverName` a string of the name of the server
- `q` a string of the query given by the user
You have to construct 2 urls, using `q` as a search parameter,
prepending a `'/'` and for the 2nd appending `'_backup'`.
Then return the first value of those 2 calls
```js
queryServers('pouet', 'hello+world')
// return the fastest of those 2 calls:
// -> getJSON('/pouet?q=hello+world')
// -> getJSON('/pouet_backup?q=hello+world')
```
Create a `gougleSearch` function that takes a single query argument.
It must call `queryServers` in concurrently on 3 servers:
`'web'`, `'image'` and `'video'`.
A timeout of 80milliseconds must be set for the whole operation.
You must return the value from each servers in an object
using a the server name as key.
### Notions
- [https://devdocs.io/javascript/global_objects/promise/race](https://devdocs.io/javascript/global_objects/promise/race)
- [https://devdocs.io/javascript/global_objects/promise/all](https://devdocs.io/javascript/global_objects/promise/all)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
// fake `getJSON` function
let getJSON = async (url) => url
```
## Gougle Search
### Instructions
Create the `queryServers` function, that takes 2 arguments:
- `serverName` a string of the name of the server
- `q` a string of the query given by the user
You have to construct 2 urls, using `q` as a search parameter,
prepending a `'/'` and for the 2nd appending `'_backup'`.
Then return the first value of those 2 calls
```js
queryServers('pouet', 'hello+world')
// return the fastest of those 2 calls:
// -> getJSON('/pouet?q=hello+world')
// -> getJSON('/pouet_backup?q=hello+world')
```
Create a `gougleSearch` function that takes a single query argument.
It must call `queryServers` in concurrently on 3 servers:
`'web'`, `'image'` and `'video'`.
A timeout of 80milliseconds must be set for the whole operation.
You must return the value from each servers in an object
using a the server name as key.
### Notions
- [devdocs.io/javascript/global_objects/promise/race](https://devdocs.io/javascript/global_objects/promise/race)
- [devdocs.io/javascript/global_objects/promise/all](https://devdocs.io/javascript/global_objects/promise/all)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
// fake `getJSON` function
let getJSON = async (url) => url
```

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## Greedy Url
### Instructions
Write 3 functions :
- `getURL` that returns an array with all valid URLs present in a data-set, http and https
- `greedyQuery` that returns URL with at least 3 or more parameters from all URLs that contain a query.
- `notSoGreedy` that returns URL with at least 2, but not more then 3 parameters from all URLs that contain a query.
You can search for greedy quantifiers for help
### Notions
- [https://github.com/ziishaned/learn-regex](https://github.com/ziishaned/learn-regex)
## Greedy Url
### Instructions
Write 3 functions :
- `getURL` that returns an array with all valid URLs present in a data-set, http and https
- `greedyQuery` that returns URL with at least 3 or more parameters from all URLs that contain a query.
- `notSoGreedy` that returns URL with at least 2, but not more then 3 parameters from all URLs that contain a query.
You can search for greedy quantifiers for help
### Notions
- [github.com/ziishaned/learn-regex](https://github.com/ziishaned/learn-regex)

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## Index Of
### Instructions
Create 3 functions:
- `indexOf` that returns the index of the first occurence of a value
- `lastIndexOf` that returns the index of the last occurence of a value
- `includes` that returns true if the value was found in the array
> If a value is not found, the returned index is -1
> functions should have an array element as first argument,
> both `indexOf` and `lastIndexOf` take an additional `fromIndex` argument
> that allows you to begin searching from a specific index.
### Notions
- [https://devdocs.io/javascript/global_objects/array/indexof](https://devdocs.io/javascript/global_objects/array/indexof)
- [https://devdocs.io/javascript/global_objects/array/lastindexof](https://devdocs.io/javascript/global_objects/array/lastindexof)
- [https://devdocs.io/javascript/global_objects/array/includes](https://devdocs.io/javascript/global_objects/array/includes)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Array.prototype.indexOf = undefined
Array.prototype.lastIndexOf = undefined
Array.prototype.includes = undefined
```
## Index Of
### Instructions
Create 3 functions:
- `indexOf` that returns the index of the first occurence of a value
- `lastIndexOf` that returns the index of the last occurence of a value
- `includes` that returns true if the value was found in the array
> If a value is not found, the returned index is -1
> functions should have an array element as first argument,
> both `indexOf` and `lastIndexOf` take an additional `fromIndex` argument
> that allows you to begin searching from a specific index.
### Notions
- [devdocs.io/javascript/global_objects/array/indexof](https://devdocs.io/javascript/global_objects/array/indexof)
- [devdocs.io/javascript/global_objects/array/lastindexof](https://devdocs.io/javascript/global_objects/array/lastindexof)
- [devdocs.io/javascript/global_objects/array/includes](https://devdocs.io/javascript/global_objects/array/includes)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Array.prototype.indexOf = undefined
Array.prototype.lastIndexOf = undefined
Array.prototype.includes = undefined
```

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## Interpolation
### Instructions
Create a function called `interpolation` that takes an object with 5 properties
`step`, `start`, `end`, `callback` and `duration`.
This function must calculate the interpolation points, (x, y),
from the `start` position to `end` position depending on the number of `steps`.
All the points must be calculated in the duration time.
For each interpolation point you must execute and pass as parameters to the callback the interpolation point ([x, y])
### Example
```
steps = 5
start = 0
end = 1
duration = 10
t
|
10 |___________________. <- execute callback([1.0, 10])
| |
| |
8 |_______________. |
| | |
| | |
6 |___________. | |
| | | |
| | | |
4 |_______. | | |
| | | | |
| | | | |
2 |___. | | | |
| | | | | |
|___|___|___|___|___|__d
0 0.2 0.4 0.6 0.8 1
```
### Notions
- [https://javascript.info/settimeout-setinterval](https://javascript.info/settimeout-setinterval)
## Interpolation
### Instructions
Create a function called `interpolation` that takes an object with 5 properties
`step`, `start`, `end`, `callback` and `duration`.
This function must calculate the interpolation points, (x, y),
from the `start` position to `end` position depending on the number of `steps`.
All the points must be calculated in the duration time.
For each interpolation point you must execute and pass as parameters to the callback the interpolation point ([x, y])
### Example
```
steps = 5
start = 0
end = 1
duration = 10
t
|
10 |___________________. <- execute callback([1.0, 10])
| |
| |
8 |_______________. |
| | |
| | |
6 |___________. | |
| | | |
| | | |
4 |_______. | | |
| | | | |
| | | | |
2 |___. | | | |
| | | | | |
|___|___|___|___|___|__d
0 0.2 0.4 0.6 0.8 1
```
### Notions
- [javascript.info/settimeout-setinterval](https://javascript.info/settimeout-setinterval)

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## Invert
### Instructions
Create a function called `invert` that inverts the object keys and values.
### Notions
- [https://devdocs.io/javascript/global_objects/object](https://devdocs.io/javascript/global_objects/object)
## Invert
### Instructions
Create a function called `invert` that inverts the object keys and values.
### Notions
- [devdocs.io/javascript/global_objects/object](https://devdocs.io/javascript/global_objects/object)

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## Ion Out
### Instructions
Make a function `ionOut` that receives a string and returns an array with every
word containing 'ion' following a t, without the 'ion'.
### Notions
- [https://github.com/ziishaned/learn-regex#4-lookarounds](https://github.com/ziishaned/learn-regex#4-lookarounds)
## Ion Out
### Instructions
Make a function `ionOut` that receives a string and returns an array with every
word containing 'ion' following a t, without the 'ion'.
### Notions
- [github.com/ziishaned/learn-regex#4-lookarounds](https://github.com/ziishaned/learn-regex#4-lookarounds)

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## Its A Match
### Instructions
Create 4 regular expression in variables:
- `normal` matches with the expression 'hi'.
- `begin` matches with the expression 'hi',
only when it is in the beginning.
- `end` matches with the expression 'hi',
only when it is in the end.
- `beginEnd` matches with the expression 'hi',
only when it is in the beginning and the end.
### Notions
- [https://github.com/ziishaned/learn-regex#28-anchors](https://github.com/ziishaned/learn-regex#28-anchors)
## Its A Match
### Instructions
Create 4 regular expression in variables:
- `normal` matches with the expression 'hi'.
- `begin` matches with the expression 'hi',
only when it is in the beginning.
- `end` matches with the expression 'hi',
only when it is in the end.
- `beginEnd` matches with the expression 'hi',
only when it is in the beginning and the end.
### Notions
- [github.com/ziishaned/learn-regex#28-anchors](https://github.com/ziishaned/learn-regex#28-anchors)

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## Keep Cut
### Instructions
Create the `cutFirst` function that takes a string
and remove the 2 first characters.
Create the `cutLast` function that takes a string
and remove the 2 last characters.
Create the `cutFirstLast` function that takes a string as parameter
and remove the 2 first characters and 2 last characters.
Create a `keepFirst` function that takes a string as parameter
and return the string only keeping the 2 first characters.
Create a `keepLast` function that takes a string as parameter
and return the string only keeping the 2 last characters.
Create a `keepFirstLast` function that takes a string as parameter
and only keep 2 first characters and 2 last characters.
### Notions
- [https://devdocs.io/javascript/global_objects/array/slice](https://devdocs.io/javascript/global_objects/array/slice)
## Keep Cut
### Instructions
Create the `cutFirst` function that takes a string
and remove the 2 first characters.
Create the `cutLast` function that takes a string
and remove the 2 last characters.
Create the `cutFirstLast` function that takes a string as parameter
and remove the 2 first characters and 2 last characters.
Create a `keepFirst` function that takes a string as parameter
and return the string only keeping the 2 first characters.
Create a `keepLast` function that takes a string as parameter
and return the string only keeping the 2 last characters.
Create a `keepFirstLast` function that takes a string as parameter
and only keep 2 first characters and 2 last characters.
### Notions
- [devdocs.io/javascript/global_objects/array/slice](https://devdocs.io/javascript/global_objects/array/slice)

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## Match Cron
### Instructions
Create a function called `matchCron` it takes a valid cron schedule string
and a valid date. \
It returns true if the date match the pattern
> You only have to implement numbers and `*`. \
> other complex patterns are not required.
Only valid pattern will be tested.
### Example
```js
matchCron('9 * * * *', new Date('2020-05-30 18:09:00')) // -> true
matchCron('9 * * * *', new Date('2020-05-30 19:09:00')) // -> true
matchCron('9 * * * *', new Date('2020-05-30 19:21:00')) // -> false
// | | | | |
// | | | | +- Day of the Week (range: 1-7, 1 standing for Monday)
// | | | +--- Month of the Year (range: 1-12)
// | | +----- Day of the Month (range: 1-31)
// | +------- Hour (range: 0-23)
// +--------- Minute (range: 0-59)
```
### Notions
- [crontab.guru/](https://crontab.guru/)
- [devdocs.io/javascript/global_objects/date](https://devdocs.io/javascript/global_objects/date)
## Match Cron
### Instructions
Create a function called `matchCron` it takes a valid cron schedule string
and a valid date. \
It returns true if the date match the pattern
> You only have to implement numbers and `*`. \
> other complex patterns are not required.
Only valid pattern will be tested.
### Example
```js
matchCron('9 * * * *', new Date('2020-05-30 18:09:00')) // -> true
matchCron('9 * * * *', new Date('2020-05-30 19:09:00')) // -> true
matchCron('9 * * * *', new Date('2020-05-30 19:21:00')) // -> false
// | | | | |
// | | | | +- Day of the Week (range: 1-7, 1 standing for Monday)
// | | | +--- Month of the Year (range: 1-12)
// | | +----- Day of the Month (range: 1-31)
// | +------- Hour (range: 0-23)
// +--------- Minute (range: 0-59)
```
### Notions
- [crontab.guru](https://crontab.guru/)
- [devdocs.io/javascript/global_objects/date](https://devdocs.io/javascript/global_objects/date)

4
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### Notions
- [nan-academy.github.io/js-training/examples/functions.js](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/ternary.js](https://nan-academy.github.io/js-training/examples/ternary.js)
- [nan-academy.github.io/js-training/examples/functions](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/ternary](https://nan-academy.github.io/js-training/examples/ternary.js)
- [devdocs.io/javascript/global_objects/math/min](https://devdocs.io/javascript/global_objects/math/min)
- [devdocs.io/javascript/global_objects/math/max](https://devdocs.io/javascript/global_objects/math/max)

30
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## More Or Less
### Instructions
Create 4 functions
- `more` that takes 1 argument and add 1 to it
- `less` that takes 1 argument and substract 1 to it
- `add` that takes 2 arguments and add them
- `sub` that takes 2 arguments and substract them
### Notions
- [nan-academy.github.io/js-training/examples/functions.js](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/primitive-and-operators.js](https://nan-academy.github.io/js-training/examples/primitive-and-operators.js)
## More Or Less
### Instructions
Create 4 functions
- `more` that takes 1 argument and add 1 to it
- `less` that takes 1 argument and substract 1 to it
- `add` that takes 2 arguments and add them
- `sub` that takes 2 arguments and substract them
### Notions
- [nan-academy.github.io/js-training/examples/functions](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/primitive-and-operators](https://nan-academy.github.io/js-training/examples/primitive-and-operators.js)

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### Notions
- [nan-academy.github.io/js-training/examples/set.js](https://nan-academy.github.io/js-training/examples/set.js)
- [nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)
- [nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [nan-academy.github.io/js-training/examples/set](https://nan-academy.github.io/js-training/examples/set.js)
- [nan-academy.github.io/js-training/examples/get](https://nan-academy.github.io/js-training/examples/get.js)
- [nan-academy.github.io/js-training/examples/data-structures](https://nan-academy.github.io/js-training/examples/data-structures.js)
### Code provided

30
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## Nasa
### Instructions
Create a `nasa` function that takes a number `N` as a parameter and returns
a string with all numbers from 1 to the `N` separated by whitespace, with three exceptions:
- For numbers divisible by 3, add 'NA'.
- For numbers divisible by 5, add 'SA'.
- For the number that are divisible by 3 and 5 add 'NASA'.
### Notions
- [nan-academy.github.io/js-training/examples/loops.js](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion.js](https://nan-academy.github.io/js-training/examples/recursion.js)
## Nasa
### Instructions
Create a `nasa` function that takes a number `N` as a parameter and returns
a string with all numbers from 1 to the `N` separated by whitespace, with three exceptions:
- For numbers divisible by 3, add 'NA'.
- For numbers divisible by 5, add 'SA'.
- For the number that are divisible by 3 and 5 add 'NASA'.
### Notions
- [nan-academy.github.io/js-training/examples/loops](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion](https://nan-academy.github.io/js-training/examples/recursion.js)

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subjects/primitives.en.md
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## Primitives
### Instructions
Create a constant variable for each primitives:
- `str` for `String`
- `num` for `Number`
- `bool` for `Boolean`
- `undef` for `undefined`
### Notions
- [nan-academy.github.io/js-training/examples/primitive-and-operators.js](https://nan-academy.github.io/js-training/examples/primitive-and-operators.js)
- [nan-academy.github.io/js-training/examples/variables.js](https://nan-academy.github.io/js-training/examples/variables.js)
## Primitives
### Instructions
Create a constant variable for each primitives:
- `str` for `String`
- `num` for `Number`
- `bool` for `Boolean`
- `undef` for `undefined`
### Notions
- [nan-academy.github.io/js-training/examples/primitive-and-operators](https://nan-academy.github.io/js-training/examples/primitive-and-operators.js)
- [nan-academy.github.io/js-training/examples/variables](https://nan-academy.github.io/js-training/examples/variables.js)

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## Pyramid
### Instructions
Create a `pyramid` function that takes a string and a number as parameters
and return a pyramid constructed by the string passed as argument and with the depth
of the number passed as argument.
Just like triangle
### Output example
- `*` character and depth of 5 :
```
*
***
*****
*******
*********
```
> No new line in last line
### Notions
- [nan-academy.github.io/js-training/examples/loops.js](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion.js](https://nan-academy.github.io/js-training/examples/recursion.js)
## Pyramid
### Instructions
Create a `pyramid` function that takes a string and a number as parameters
and return a pyramid constructed by the string passed as argument and with the depth
of the number passed as argument.
Just like triangle
### Output example
- `*` character and depth of 5 :
```
*
***
*****
*******
*********
```
> No new line in last line
### Notions
- [nan-academy.github.io/js-training/examples/loops](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion](https://nan-academy.github.io/js-training/examples/recursion.js)

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## Race
### Instructions
Create a function `race` that works like `Promise.race`
Create a function `some` that takes an array of promises or values
and a number and return the first resolved values up to the number given.
> Empty array or a count of 0 return a promise resolving to `undefined`
### Notions
- [nan-academy.github.io/js-training/examples/promise.js](https://nan-academy.github.io/js-training/examples/promise.js)
- [devdocs.io/javascript/global_objects/promise/race](https://devdocs.io/javascript/global_objects/promise/race)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Promise.race = undefined
```
## Race
### Instructions
Create a function `race` that works like `Promise.race`
Create a function `some` that takes an array of promises or values
and a number and return the first resolved values up to the number given.
> Empty array or a count of 0 return a promise resolving to `undefined`
### Notions
- [nan-academy.github.io/js-training/examples/promise](https://nan-academy.github.io/js-training/examples/promise.js)
- [devdocs.io/javascript/global_objects/promise/race](https://devdocs.io/javascript/global_objects/promise/race)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Promise.race = undefined
```

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## Repeat
### Instructions
Create a `repeat` function that takes a string and a number as parameters
and return the repeated string by the given number
Like the method [developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat)
Of course you may not use the method directly
### Notions
- [nan-academy.github.io/js-training/examples/loops.js](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion.js](https://nan-academy.github.io/js-training/examples/recursion.js)
- [devdocs.io/javascript/global_objects/string/repeat](https://devdocs.io/javascript/global_objects/string/repeat)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
String.prototype.repeat = undefined
```
## Repeat
### Instructions
Create a `repeat` function that takes a string and a number as parameters
and return the repeated string by the given number
Like the method [developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat)
Of course you may not use the method directly
### Notions
- [nan-academy.github.io/js-training/examples/loops](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion](https://nan-academy.github.io/js-training/examples/recursion.js)
- [devdocs.io/javascript/global_objects/string/repeat](https://devdocs.io/javascript/global_objects/string/repeat)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
String.prototype.repeat = undefined
```

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## Replica
### Instructions
Create a function called `replica` that allows you to deep assign the values of all properties from one or more
objects to a target object.
Attention with the shallow copies.
### Notions
- [nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
## Replica
### Instructions
Create a function called `replica` that allows you to deep assign the values of all properties from one or more
objects to a target object.
Attention with the shallow copies.
### Notions
- [nan-academy.github.io/js-training/examples/data-structures](https://nan-academy.github.io/js-training/examples/data-structures.js)

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## Returns
### Instructions
Create the following functions:
- `id` that takes one argument and return it
- `getLength` that takes an array or a string and return its length
### Notions
- [https://nan-academy.github.io/js-training/examples/functions.js](https://nan-academy.github.io/js-training/examples/functions.js)
- [https://nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [https://nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)
## Returns
### Instructions
Create the following functions:
- `id` that takes one argument and return it
- `getLength` that takes an array or a string and return its length
### Notions
- [nan-academy.github.io/js-training/examples/functions](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/data-structures](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [nan-academy.github.io/js-training/examples/get](https://nan-academy.github.io/js-training/examples/get.js)

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## Series
### Instructions
Create a function `series` that works takes an array of async functions.
It must execute them in series and return the results in order.
### Notions
- [nan-academy.github.io/js-training/examples/promise.js](https://nan-academy.github.io/js-training/examples/promise.js)
## Series
### Instructions
Create a function `series` that works takes an array of async functions.
It must execute them in series and return the results in order.
### Notions
- [nan-academy.github.io/js-training/examples/promise](https://nan-academy.github.io/js-training/examples/promise.js)

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## Sign
### Instructions
Create the `sign` function that takes one number argument
and return 1 if the number is positive, -1 if the number is negative
and 0 if the number is exactly 0
You must not just use `Math.sign`, make your own.
Create the `sameSign` function that takes 2 numbers as arguments and return true
if they both have the same sign, or false otherwise.
### Notions
- [nan-academy.github.io/js-training/examples/functions.js](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/if-else.js](https://nan-academy.github.io/js-training/examples/if-else.js)
- [devdocs.io/javascript/global_objects/math/sign](https://devdocs.io/javascript/global_objects/math/sign)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Math.sign = undefined
```
## Sign
### Instructions
Create the `sign` function that takes one number argument
and return 1 if the number is positive, -1 if the number is negative
and 0 if the number is exactly 0
You must not just use `Math.sign`, make your own.
Create the `sameSign` function that takes 2 numbers as arguments and return true
if they both have the same sign, or false otherwise.
### Notions
- [nan-academy.github.io/js-training/examples/functions](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/if-else](https://nan-academy.github.io/js-training/examples/if-else.js)
- [devdocs.io/javascript/global_objects/math/sign](https://devdocs.io/javascript/global_objects/math/sign)
### Code provided
> all code provided will be added to your solution and doesn't need to be submited.
```js
Math.sign = undefined
```

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## Triangle
### Instructions
Create a `triangle` function that takes a string and a number as parameters
and return a triangle constructed by the string passed as argument and with the depth
of the number passed as argument.
### Output example
- `*` character and depth of 5:
```
*
**
***
****
*****
```
> No new line in last line
### Notions
- [nan-academy.github.io/js-training/examples/loops.js](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion.js](https://nan-academy.github.io/js-training/examples/recursion.js)
## Triangle
### Instructions
Create a `triangle` function that takes a string and a number as parameters
and return a triangle constructed by the string passed as argument and with the depth
of the number passed as argument.
### Output example
- `*` character and depth of 5:
```
*
**
***
****
*****
```
> No new line in last line
### Notions
- [nan-academy.github.io/js-training/examples/loops](https://nan-academy.github.io/js-training/examples/loops.js)
- [nan-academy.github.io/js-training/examples/recursion](https://nan-academy.github.io/js-training/examples/recursion.js)

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