Array iteration examples.

common-iteration.js

(function () {
    var knights = ['King Arthur', 'Sir Lancelot', 'Patsy', 'Sir Robin', 'Sir Bedevere', 'Sir Galahad'];
    for (var i = 0; i < knights.length; i++) {
        console.log(knights[i] + ': bunny kibble.');
    }    
}());

faster-iteration.js

(function () {
    var knights = ['King Arthur', 'Sir Lancelot', 'Patsy', 'Sir Robin', 'Sir Bedevere', 'Sir Galahad'],
        length = knights.length, // cache the length
        i = 0; // pre-initialize

    for (; i < length; i++) {
        console.log(knights[i] + ': died in a furry flash.');
    }
}());

new-for-line.js

    for (; knight = knights[i++] ;) {

old-for-line.js

    for (var i = 0; i < knights.length; i++) {

syntax-sugar.js

(function () {
    var knight,
        knights = ['King Arthur', 'Sir Lancelot', 'Patsy', 'Sir Robin', 'Sir Bedevere', 'Sir Galahad'],
        i = 0;

    for (; knight = knights[i++] ;) {
        console.log(knight + ': life shortened by a hare.');
    }
}());

while-sugar.js

(function () {
    var knight,
        knights = ['King Arthur', 'Sir Lancelot', 'Patsy', 'Sir Robin', 'Sir Bedevere', 'Sir Galahad'],
        i = 0;

    while ( knight = knights[i++] ) {
        console.log(knight + ': life shortened by a hare.');
    }
}());

while.js

(function () {
    var knights = ['King Arthur', 'Sir Lancelot', 'Patsy', 'Sir Robin', 'Sir Bedevere', 'Sir Galahad'],
        i = knights.length;

    while (i--) {
        console.log(knights[i] + ': tripped while running backwards.');
    }
}());