JavaScript ES5 simple polyfills.js

/**
 * This is a simple list of ES5 JS polyfills and snippets I commonly need to add to code for it to run on IE8 or legacy JS engines.
 * No particular order.
 */

// Check for __proto__ support.
function a() {}
if ( (new a).__proto__ === a.prototype ){
    alert('supported');
}else{
    alert('not supported')
}

// add support for getPrototypeOf (use when there's __proto__ support)
 if (!Object.getPrototypeOf){
    Object.getPrototypeOf = function (obj) {
        return obj.__proto__;
    };
}