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## Manipulate Entries
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### Instructions
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Create 3 functions which work like the `.filter`, `.map` and `.reduce` array methods, but for the **entries** in the grocery cart.
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- `filterEntries`: filters using both key and value.
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- `mapEntries`: changes the key, the value or both.
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- `reduceEntries`: reduces the entries.
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Create 3 additional functions that use your previously created functions:
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- `totalCalories`: that will return the total calories of a cart.
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- `lowCarbs`: that leaves only those items which are lower than 50grams.
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- `cartTotal`: that will give you the right amount of calories, proteins... and **all the other** items in your grocery cart.
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> Think about the shape of `Object.entries()`
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### Code provided
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> The provided code will be added to your solution, and does not need to be submitted.
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```js
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// small database with nutrition facts, per 100 grams
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// prettier-ignore
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const nutritionDB = {
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tomato: { calories: 18, protein: 0.9, carbs: 3.9, sugar: 2.6, fiber: 1.2, fat: 0.2 },
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vinegar: { calories: 20, protein: 0.04, carbs: 0.6, sugar: 0.4, fiber: 0, fat: 0 },
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oil: { calories: 48, protein: 0, carbs: 0, sugar: 123, fiber: 0, fat: 151 },
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onion: { calories: 0, protein: 1, carbs: 9, sugar: 0, fiber: 0, fat: 0 },
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garlic: { calories: 149, protein: 6.4, carbs: 33, sugar: 1, fiber: 2.1, fat: 0.5 },
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paprika: { calories: 282, protein: 14.14, carbs: 53.99, sugar: 1, fiber: 0, fat: 12.89 },
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sugar: { calories: 387, protein: 0, carbs: 100, sugar: 100, fiber: 0, fat: 0 },
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orange: { calories: 49, protein: 0.9, carbs: 13, sugar: 9, fiber: 0.2, fat: 0.1 },
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}
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```
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### Notions
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- [filter](https://devdocs.io/javascript/global_objects/array/filter)
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- [map](https://devdocs.io/javascript/global_objects/array/map)
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- [reduce](https://devdocs.io/javascript/global_objects/array/reduce)
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- [entries](https://devdocs.io/javascript/global_objects/object/entries)
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- [fromentries](https://devdocs.io/javascript/global_objects/object/fromentries)
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