javascript - How to produce an array from an object where the number of elements is determined by Object.values?

Question

I have an object like so:

{ green: 2, blue: 1, red: 2}

How can I turn it into an array that looks like this:

[ 'green', 'green', 'blue', 'red', 'red']

Answer 1

Could be done like this:

Object.entries(obj).flatMap(([k, v]) => Array(v).fill(k));

Example:

const obj = { green: 2, blue: 1, red: 2};
const res = Object.entries(obj).flatMap(([k, v]) => Array(v).fill(k));
console.log(res);