iteration.js

var arr = [1,2,3];
​
// for length: the classic version
for (var i = 0; i < arr.length; i++) {
	console.log(arr[i]);
}
​
// for of: simpler version of for length
for (var element of arr) {
	console.log(element);
}
​
// for in (never use this) - iterates all available keys
// might also iterate over prototype functions
for (var element in arr) {
	console.log(element);
}
​
// prototypal function that opens a new scope for every
// iteration
arr.forEach(function(element) {
	console.log(element);
});
​
// someone fucked up Array#forEach
arr.every(function(element) {
	console.log(element);
});
​
// wat
arr.some(function(element) {
	console.log(element);
});