Javascript String remove(idx)

String.prototype.remove = function (idx) {
 var arr = this.split("");
 arr.splice(idx, 1);/*from ww  w.jav  a2 s . co m*/
 arr = arr.join('');
 arr = arr.toString();
 return arr;
}

String.prototype.removeCharacters = function() {
 //debugger;
 var twoStrings = this.split(", "),
 array2 = twoStrings[1],
 array1= twoStrings[0],
 temp = "";

 for (var i = 0, length = array2.length; i < length; i++) {
  for (var j = 0, l = array1.length; j < l; j++) {
   if (array1[j] == array2[i]) {
    array1 = array1.remove(j);
    j--; 
   }
  }
 }
 return array1;
}

console.log(line.removeCharacters());