How to rearrange an array by indices array?

Question

Given an array arr and an array of indices ind, I\'d like to rearrange arr in-place to satisfy the given indices. For exa

Answer 1

Try this:

var result = new Array(5);
for (int i = 0; i < result.length; i++) {
    result[i] = arr[ind[i]];
}
console.log(arr);

Answer 2

I am using ind as indexes in it's own order

var arr = ["A", "B", "C", "D", "E", "F"];
var ind = [4, 0, 5, 2, 1, 3];
var obj = {}
for(var i=0;i<arr.length;i++)
    obj[ind[i]]=arr[i];
console.log(obj);

Working Fiddle

Answer 3

var arr = ["A", "B", "C", "D", "E", "F"];
var ind = [4, 0, 5, 2, 1, 3];

function rearrange(arr, ind){
  var map = [];
  for (var i = 0; i < arr.length; i++)   map[ind[i]] = arr[i];
  for (var i = 0; i < arr.length; i++)   arr[i] = map[i];
}

rearrange(arr, ind);

console.log(arr);

That works but, because I'm not a smart developper, I assume it's probably not the fastest algorithm.