"use strict";

// Script should not have many global objects.
// One for one script is recommended.
var APP = {};

APP.my_property = "I My Me Mine.";

(function () {
    var a = 1,
        b = 2,
        sum = a + b,
        myObject = {}; // Declare all objects first as one line.

    function doForLoop() {
        var i = 0;
            myArray = [1, 2, 3],
            len = myArray.length; // Length of an array should be cached.
        for (i = 0; i < len; i += 1) {
            console.log(myArray[i]);
        }
    }

    function doForInLoop() {
        var i = 0,
            hasOwn = Object.prototype.hasOwnProperty;
            myHash = {
            one: 1,
            two: 2,
            three: 3
        };
        for (i in myHash) {
            // Loop only own properties but extended properties
            if (hasOwn.call(myHash, i)) {
                console.log(i, myHash[i]);
            }
        }
    }

    function doSwitch() {
        var unknown_numer = 0,
            result = '';
        switch (unknown_number) {
        case 0:
            result = "zero";
            break;
        case 1:
            result = "one";
            break;
        default:
            result = "unknown";
        }
    }

    function compareExactly() {
        var zero = 0;
        if (zero === "") {
            // Never be executed.
        }
    }
});