[devote]

вот полифил filter:

if (!Array.prototype.filter) {
  Array.prototype.filter = function(fun /*, thisp*/) {
    'use strict';

    if (!this) {
      throw new TypeError();
    }

    var objects = Object(this);
    var len = objects.length >>> 0;
    if (typeof fun !== 'function') {
      throw new TypeError();
    }

    var res = [];
    var thisp = arguments[1];
    for (var i in objects) {
      if (objects.hasOwnProperty(i)) {
        if (fun.call(thisp, objects[i], i, objects)) {
          res.push(objects[i]);
        }
      }
    }

    return res;
  };
}

И соответственно indexOf:

if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
    'use strict';
    if (this == null) {
      throw new TypeError();
    }
    var n, k, t = Object(this),
        len = t.length >>> 0;

    if (len === 0) {
      return -1;
    }
    n = 0;
    if (arguments.length > 1) {
      n = Number(arguments[1]);
      if (n != n) { // shortcut for verifying if it's NaN
        n = 0;
      } else if (n != 0 && n != Infinity && n != -Infinity) {
        n = (n > 0 || -1) * Math.floor(Math.abs(n));
      }
    }
    if (n >= len) {
      return -1;
    }
    for (k = n >= 0 ? n : Math.max(len - Math.abs(n), 0); k < len; k++) {
      if (k in t && t[k] === searchElement) {
        return k;
      }
    }
    return -1;
  };
}