Iterating over Arrays for IE using JQuery

ie_iterator.js

if (typeof Array.prototype.indexOf == "undefined") {
    Array.prototype.indexOf = function(value) {
      for (var i = 0; i < this.length; i++) {
        if (this[i] == value) {
          return i;
        }
      }
      return -1;
    }
  }
  
if (typeof Array.prototype.filter == "undefined") {
  Array.prototype.filter = function(proc) {
    var result = []
    for (var i = 0; i < this.length; i++) {
      if (proc(this[i])) {
        result.push(this[i]);
      }
    }
    return result;
  }
}