Check an object if all of its childrens are empty.

empty.js

/*
 * @file Check an object if all of its childrens are empty.
 * @author Dafrok
 * @param {object} obj
 * @return {boolean} If all of the childrens of the target object are empty, it will be true, else, false.
*/

;var empty = (function () {
    var isEmpty
    function type (obj) {
        return Object.prototype.toString.call(obj).split(/ |\[|\]/g)[2]
    }
    function walkObject (obj) {
        switch (type(obj)) {
            case 'Object':
                for (var key in obj) {
                    walkObject(obj[key])
                }
                break
            case 'Array':
                for (var i = 0; i < obj.length; i++) {
                    walkObject(obj[i])
                }
                break
            case 'String':
                if (!obj) {
                    isEmpty = false
                } else {
                    break
                }
            case 'Undefined':
            case 'Null':
                break
            default:
                isEmpty = false
        }
    }
    function check (obj) {
        isEmpty = true
        walkObject(obj)
        return isEmpty
    }
    return check
})();