DOM.js

(function (win, doc) {
    'use strict';

    function DOM(elements) {
        this.element = doc.querySelectorAll(elements);
    }

    DOM.prototype.on = function on(eventType, callback) {
        Array.prototype.forEach.call(this.element, function (element) {
            element.addEventListener(eventType, callback, false);
        });
        this.element.addEventListener(eventType, callback, false);
    }

    DOM.prototype.off = function off(eventType, callback) {
        Array.prototype.forEach.call(this.element, function (element) {
            element.addEventListener(eventType, callback, false);
        });
    }

    DOM.prototype.get = function get() {
        return this.element;
    }

    DOM.prototype.forEach = function forEach() {
        return Array.prototype.forEach.apply(this.element, arguments);
    }

    DOM.prototype.map = function map() {
        return Array.prototype.map.apply(this.element, arguments);
    }

    DOM.prototype.filter = function filter() {
        return Array.prototype.filter.apply(this.element, arguments);
    }

    DOM.prototype.reduce = function reduce() {
        return Array.prototype.reduce.apply(this.element, arguments);
    }

    DOM.prototype.reduceRight = function reduceRight() {
        return Array.prototype.reduceRight.apply(this.element, arguments);
    }

    DOM.prototype.some = function some() {
        return Array.prototype.some.apply(this.element, arguments);
    }

    DOM.prototype.isArray = function isArray(param) {
        return Object.prototype.toString.call(param) === '[object Array]';
    }

    DOM.prototype.isObject = function isObject(param) {
        return Object.prototype.toString.call(param) === '[object Object]';
    }

    DOM.prototype.isFunction = function isFunction(param) {
        return Object.prototype.toString.call(param) === '[object Function]';
    }

    DOM.prototype.isNumber = function isNumber(param) {
        return Object.prototype.toString.call(param) === '[object Number]';
    }

    DOM.prototype.isString = function isString(param) {
        return Object.prototype.toString.call(param) === '[object String]';
    }

    DOM.prototype.isBoolean = function isBoolean(param) {
        return Object.prototype.toString.call(param) === '[object Boolean]';
    }

    DOM.prototype.isNull = function isNull(param) {
        return Object.prototype.toString.call(param) === '[object Null]'
            || Object.prototype.toString.call(param) === '[object Underfined]';
    }

})(window, document);