## Manipulate Entries
### Instructions
Finish your groceries!!!
Create 3 functions that works like the `.filter` , `.map` and `.reduce` array method but for the entries of the grocery cart.
- `filterEntries` filters using both key and value.
- `mapEntries` changes either the key or the value or both.
- `reduceEntries` reduce over entries.
Create 3 other functions that use your previously create functions:
- `totalCalories` that will return the total calories of a cart
- `lowCarbs` that will leave only items that total carbs are lower than 50grams
- `cartTotal` that will give you the right amount of calories, proteins, ..., of all items in your grocery cart.
### Clarification
What the functions will take as argument is an object cart which contains the food rations. All the nutrition in the nutritionDB object are measured per 100 grams.
### 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: 9, fiber: 0.2, fat: 0.1 },
}
```
