public/subjects/manipulate-entries.en.md

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.

Notions

• https://devdocs.io/javascript/global_objects/array/filter
• https://devdocs.io/javascript/global_objects/array/map
• https://devdocs.io/javascript/global_objects/array/reduce
• https://devdocs.io/javascript/global_objects/object/entries
• https://devdocs.io/javascript/global_objects/object/fromentries

Code provided

// 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   },
}