Custom 'sort' function

sort.js

var sort = function(arr){
  var newArray = [];
  var copyOfArr = arr;
  var count = arr.length;

  while(copyOfArr.length > 0){
    var minIndex = copyOfArr.indexOf(Math.min.apply(null, arr));
    newArray.push(Number(copyOfArr.splice(minIndex, 1)));
  }
  return newArray;
};

I tried using the find function but I got an error so I made my own (line 7).