|
|
|
|
## Manipulate Keys
|
|
|
|
|
|
|
|
|
|
### Instructions
|
|
|
|
|
|
|
|
|
|
I do not want onions. I want oranges!!!
|
|
|
|
|
|
|
|
|
|
Create 3 functions that works like the `.filter`, `.map` and `.reduce` array method but for the keys of your grocery cart.
|
|
|
|
|
|
|
|
|
|
- `filterKeys` filters the name of the items you have.
|
|
|
|
|
- `mapKeys` changes the name of the items you have.
|
|
|
|
|
- `reduceKeys` reducing you grocery cart.
|
|
|
|
|
|
|
|
|
|
### Examples
|
|
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
const nutrients = { carbohydrates: 12, protein: 20, fat: 5 }
|
|
|
|
|
console.log(filterKeys(nutrients, (key) => /protein/.test(key)))
|
|
|
|
|
// output :
|
|
|
|
|
// { protein: 20 }
|
|
|
|
|
console.log(mapKeys(nutrients, (k) => `-${k}`))
|
|
|
|
|
// output :
|
|
|
|
|
// { -carbohydrates: 12, -protein: 20, -fat: 5 }
|
|
|
|
|
console.log(reduceKeys(nutrients, (acc, cr) =>acc.concat(', ', cr)))
|
|
|
|
|
// output :
|
|
|
|
|
// carbohydrates, protein, fat
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
### 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
|
|
|
|
|
// small database with nutrition facts, per 100 grams
|
|
|
|
|
// prettier-ignore
|
|
|
|
|
const nutritionDB = {
|
|
|
|
|
tomato: { calories: 18, protein: 0.9, carbs: 3.9, sugar: 2.6, fiber: 1.2, fat: 0.2 },
|
|
|
|
|
vinegar: { calories: 20, protein: 0.04, carbs: 0.6, sugar: 0.4, fiber: 0, fat: 0 },
|
|
|
|
|
oil: { calories: 48, protein: 0, carbs: 0, sugar: 123, fiber: 0, fat: 151 },
|
|
|
|
|
onion: { calories: 0, protein: 1, carbs: 9, sugar: 0, fiber: 0, fat: 0 },
|
|
|
|
|
garlic: { calories: 149, protein: 6.4, carbs: 33, sugar: 1, fiber: 2.1, fat: 0.5 },
|
|
|
|
|
paprika: { calories: 282, protein: 14.14, carbs: 53.99, sugar: 1, fiber: 0, fat: 12.89 },
|
|
|
|
|
sugar: { calories: 387, protein: 0, carbs: 100, sugar: 100, fiber: 0, fat: 0 },
|
|
|
|
|
orange: { calories: 49, protein: 0.9, carbs: 13, sugar: 12, fiber: 0.2, fat: 0.1 },
|
|
|
|
|
}
|
|
|
|
|
```
|
