Javascript, repeating an object key N-times, being N its value

Question

I was wondering how to do this in the more cleaner and optimal way:

I have an Object with the following structure:

{
   \"125\": 2,
   \"439\": 3,
           


        

Answer 1

Try this:

var obj = {
  "125": 2,
  "439": 3,
  "560": 1,
  "999": 2
}

var arr = [];

for (prop in obj) {
  for (var i = 0; i < obj[prop]; i++)
    arr.push(parseInt(prop));
}

console.log(arr)