(function() {
  var arr, i, k, obj, v, _i, _j, _len, _len2,
    __indexOf = Array.prototype.indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };

  arr = [1, 2, 3, 4, 5];

  obj = {
    a: 1,
    b: 2,
    c: 3,
    d: 4,
    e: 5
  };

  console.log('5 in arr: ' + (__indexOf.call(arr, 5) >= 0));

  console.log('5 in obj: ' + (__indexOf.call(obj, 5) >= 0));

  console.log('e in obj: ' + (__indexOf.call(obj, 'e') >= 0));

  console.log('5 of arr: ' + (5 in arr));

  console.log('5 of obj: ' + (5 in obj));

  console.log('e of obj: ' + ('e' in obj));

  console.log('i in arr');

  for (_i = 0, _len = arr.length; _i < _len; _i++) {
    i = arr[_i];
    console.log(i);
  }

  console.log('i in obj');

  for (_j = 0, _len2 = obj.length; _j < _len2; _j++) {
    i = obj[_j];
    console.log(i);
  }

  console.log('i of arr');

  for (i in arr) {
    console.log(i);
  }

  console.log('k of obj');

  for (k in obj) {
    console.log(k);
  }

  console.log('k, v of obj');

  for (k in obj) {
    v = obj[k];
    console.log(k + ': ' + v);
  }

  console.log('array.forEach(callback(v, k, arr))');

  arr.forEach(function(element, index, array) {
    if (index === 0) console.log('arr == array: ' + (arr === array));
    return console.log(index + ': ' + element);
  });

}).call(this);