My Library when IE8 won't be supported anymore

gistfile1.js

NodeList.prototype.forEach = HTMLCollection.prototype.forEach = Array.prototype.forEach;
NodeList.prototype.map = HTMLCollection.prototype.map = Array.prototype.map;
NodeList.prototype.filter = HTMLCollection.prototype.filter = Array.prototype.filter;
NodeList.prototype.reduce = HTMLCollection.prototype.reduce = Array.prototype.reduce;
NodeList.prototype.every = HTMLCollection.prototype.every = Array.prototype.every;
NodeList.prototype.some = HTMLCollection.prototype.some = Array.prototype.some;
var By = { 
    id: function (id) { return document.getElementById(id) }, 
    tag: function (tag, context) { 
        return (context || document).getElementsByTagName(tag)
    }, 
    "class": function (klass, context) {
        return (context || document).getElementsByClassName(klass)
    },
    name: function (name) { return document.getElementsByName(name) }, 
    qsa: function (query, context) { 
        return (context || document).querySelectorAll(query)
    },
    qs: function (query, context) {
        return (context || document).querySelector(query)
    }
}