Array dependency

[azim_hamdan]

Hi there,

How to solve this matter? It is in array.
I got 2 variables as below, and want it repeat depend on the var b;

var a  = [5,10,15]
var b = [2,1,3]

the output should be like this;

[5,5,10,15,15,15]

Thanks in advance!

[Paul_Wilkins]

This should do it.

var a = [5, 10, 15];
var b = [2, 1, 3];

function repeatValuesByAmounts(values, amounts) {
  return values.reduce(function(arr, next, index) {
    var i = amounts[index];
    while (i > 0) {
      arr.push(next);
      i -= 1;
    }
    return arr;
  }, []);
}

var c = repeatValuesByAmounts(a, b); // [5,5,10,15,15,15]