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42 lines
1.8 KiB
42 lines
1.8 KiB
5 years ago
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## manipulate-entries
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### Instructions
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Finish your groceries!!!
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Create 3 functions that works like the `.filter`, `.map` and `.reduce` array method but for the entries of the grocery cart.
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- `filterEntries` filters using both key and value.
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- `mapEntries` changes either the key or the value or both.
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- `reduceEntries` reduce over entries.
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Create 3 other functions that use your previously create functions:
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- `totalCalories` that will return the total calories of a cart
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- `lowCarbs` that will leave only items that total carbs are lower than 50grams
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- `cartTotal` that will give you the right amount of calories, proteins, ..., of all items in your grocery cart.
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### Notions
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- https://devdocs.io/javascript/global_objects/array/filter
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- https://devdocs.io/javascript/global_objects/array/map
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- https://devdocs.io/javascript/global_objects/array/reduce
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- https://devdocs.io/javascript/global_objects/object/entries
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- https://devdocs.io/javascript/global_objects/object/fromentries
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### Code provided
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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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