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The JavaScript Interview Handbook: 100+ Interview Questions

Solution Review: Make Maximum Donuts

Explore how to determine the maximum number of whole donuts you can make with given ingredient quantities in JavaScript. Understand using Object.keys, map, Math.min, and Math.floor in functional programming to solve this problem efficiently.

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Solution #

Node.js
const maxDonuts = (recipe, quantity) =>
  Math.floor(
    Math.min(...Object.keys(recipe).map(k => quantity[k] / recipe[k] || 0))
)
const ans = maxDonuts({ flour: 2, sugar: 40, butter: 20 },{ flour: 5, sugar: 120, butter: 500 })
console.log(ans)

Explanation #

The maxDonuts function takes two objects as parameters; the recipe and the quantity of ingredients available.

To make the donuts, we need all the ingredients of the recipe given. In the above scenario, we need the following:

{ flour: 2, sugar: 40, butter: 20 }

To make a whole donut, we will need either the exact amount of ingredients mentioned in the recipe or greater. We can’t make a whole donut if the amount of even a single ingredient is less than ...