(function(window) {

// standart array declaration

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

// lets make an iterator ?

// first, with function

function iterate(arr) {

var i = 0;

// return a closure that keeps i in memory

return function() {

if(arr.length == i) {

return false;

}

return arr[i++];

}

}

var next = iterate(arr);

var x;

while( x = next()) {

console.log(x);

}

// lets make iterator for all arrays

Array.prototype.iterator = function() {

var self = this;

// this will be the array

var i = 0;

return function() {

if(self.length == i) {

return false;

}

return self[i++];

}

}

console.log("Using prototype");

next = arr.iterator();

while( x = next()) {

console.log(x);

}

// check with hasOwnProperty()

log("Has own property check");

for(var omg in arr) {

if(arr.hasOwnProperty(omg)) {

console.log(omg);

}

}

})(this);