Javascript Array remove(digit)

// Remove elements
var arr = [1,2,1,4,1,3,4,1,111,3,2,1,'1'];

Array.prototype.remove = function(digit) {
  var length = arr.length;
  for (var i = 0; i < length; i+=1) {
    if (arr[i] === digit) {
    arr.splice(i, 1);//  www .ja  va  2 s . com
    }
  }
}

console.log(arr);
arr.remove(1);
console.log(arr);