public/subjects/manipulate-entries

Manipulate Entries

Instructions

Create 3 functions which work like the .filter, .map and .reduce array methods, but for the entries in the grocery cart.

• filterEntries: filters using both key and value.
• mapEntries: changes the key, the value or both.
• reduceEntries: reduces the entries.

Create 3 additional functions that use your previously created functions:

• totalCalories: that will return the total calories of a cart.
• lowCarbs: that leaves only those items which are lower than 50grams.
• cartTotal: that will give you the right amount of calories, proteins... and all the other items in your grocery cart.

Think about the shape of Object.entries()

Code provided

The provided code will be added to your solution, and does not need to be submitted.

// 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   },
}

Notions

• filter
• map
• reduce
• entries
• fromentries