mirror of https://github.com/01-edu/public.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
62 lines
1.9 KiB
62 lines
1.9 KiB
4 years ago
|
## You pass butter
|
||
|
|
|
||
|
|
### Return value
|
||
|
|
|
||
|
|
We are now going to see how to declare a function that returns an argument.
|
||
|
|
|
||
|
|
Let's say we declare the variable `ten` the following way.
|
||
|
|
|
||
|
|
```js
|
||
|
|
let ten = 5 + 5
|
||
|
|
console.log(ten) // 10
|
||
|
|
```
|
||
|
|
|
||
|
|
We could replace those `5` with a very simple function that `returns` this
|
||
|
|
result. Let's call this function `returnsFive`. Let's not put any arguments in
|
||
|
|
this function to keep it very basic. The only new concept is the `return`
|
||
|
|
keyword. This keyword will return the specified value **and** end the function
|
||
|
|
execution.
|
||
|
|
|
||
|
|
```js
|
||
|
|
let returnsFive = () => {
|
||
|
|
return 5
|
||
|
|
// ↖ the keyword `return`, returns the value right after it,
|
||
|
|
// in this case the number 5.
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
Now that the function is declared, we call it where we need it.
|
||
|
|
|
||
|
|
```js
|
||
|
|
let ten = returnsFive() + returnsFive()
|
||
|
|
console.log(ten) // 10
|
||
|
|
```
|
||
|
|
|
||
|
|
Now a question that you might ask yourself is: What if we had several `return`
|
||
|
|
keywords in the same function? Well as mentioned before, the `return` also stops
|
||
|
|
the function execution. So only the first `return` would matter. In fact that
|
||
|
|
means that anything after the `return` would not be executed. Example:
|
||
|
|
|
||
|
|
```js
|
||
|
|
let returnsFive = () => {
|
||
|
|
return 5 //ONLY this return is executed. Everything else is forgoten.
|
||
|
|
return 10 // not executed (useless)
|
||
|
|
return 'I am useless' // not executed either
|
||
|
|
console.log('I am also useless') //nor this one
|
||
|
|
}
|
||
|
|
let ten = returnsFive() + returnsFive()
|
||
|
|
console.log(ten) // 10
|
||
|
|
//exactly the same result as the previous example
|
||
|
|
```
|
||
|
|
|
||
|
|
As you may see, we get exactly the same result as the previous example.
|
||
|
|
`returnsFive` only returns 5. :)
|
||
|
|
|
||
|
|
### Instructions
|
||
|
|
|
||
|
|
As Rick's robot, you now know your purpose. (Remember? 'You pass butter.')
|
||
|
|
|
||
|
|
Define the function `passButter` that returns `The butter`.
|
||
|
|
|
||
|
|
|