(function ($) {

    if (!Array.prototype.find) {
        Object.defineProperty(Array.prototype, 'find', {
            value: function (predicate) {
                // 1. Let O be ? ToObject(this value).
                if (this == null) {
                    throw new TypeError('"this" is null or not defined');
                }

                var o = Object(this);

                // 2. Let len be ? ToLength(? Get(O, "length")).
                var len = o.length >>> 0;

                // 3. If IsCallable(predicate) is false, throw a TypeError exception.
                if (typeof predicate !== 'function') {
                    throw new TypeError('predicate must be a function');
                }

                // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
                var thisArg = arguments[1];

                // 5. Let k be 0.
                var k = 0;

                // 6. Repeat, while k < len
                while (k < len) {
                    // a. Let Pk be ! ToString(k).
                    // b. Let kValue be ? Get(O, Pk).
                    // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
                    // d. If testResult is true, return kValue.
                    var kValue = o[k];
                    if (predicate.call(thisArg, kValue, k, o)) {
                        return kValue;
                    }
                    // e. Increase k by 1.
                    k++;
                }

                // 7. Return undefined.
                return undefined;
            }
        });
    }

    if (!Array.prototype.findIndex) {
        Object.defineProperty(Array.prototype, 'findIndex', {
            value: function (predicate) {
                // 1. Let O be ? ToObject(this value).
                if (this == null) {
                    throw new TypeError('"this" is null or not defined');
                }

                var o = Object(this);

                // 2. Let len be ? ToLength(? Get(O, "length")).
                var len = o.length >>> 0;

                // 3. If IsCallable(predicate) is false, throw a TypeError exception.
                if (typeof predicate !== 'function') {
                    throw new TypeError('predicate must be a function');
                }

                // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
                var thisArg = arguments[1];

                // 5. Let k be 0.
                var k = 0;

                // 6. Repeat, while k < len
                while (k < len) {
                    // a. Let Pk be ! ToString(k).
                    // b. Let kValue be ? Get(O, Pk).
                    // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
                    // d. If testResult is true, return k.
                    var kValue = o[k];
                    if (predicate.call(thisArg, kValue, k, o)) {
                        return k;
                    }
                    // e. Increase k by 1.
                    k++;
                }

                // 7. Return -1.
                return -1;
            }
        });
    }

    if (!Array.prototype.filter) {
        Array.prototype.filter = function (func, thisArg) {
            'use strict';
            if (!((typeof func === 'Function' || typeof func === 'function') && this))
                throw new TypeError();

            var len = this.length >>> 0,
                res = new Array(len), // preallocate array
                t = this, c = 0, i = -1;
            if (thisArg === undefined)
                while (++i !== len)
                    // checks to see if the key was set
                    if (i in this)
                        if (func(t[i], i, t))
                            res[c++] = t[i];
                        else
                            while (++i !== len)
                                // checks to see if the key was set
                                if (i in this)
                                    if (func.call(thisArg, t[i], i, t))
                                        res[c++] = t[i];

            res.length = c; // shrink down array to proper size
            return res;
        };
    }

    if (!Array.prototype.every) {
        Array.prototype.every = function (callbackfn, thisArg) {
            'use strict';
            var T, k;

            if (this == null) {
                throw new TypeError('this is null or not defined');
            }

            // 1. Let O be the result of calling ToObject passing the this 
            //    value as the argument.
            var O = Object(this);

            // 2. Let lenValue be the result of calling the Get internal method
            //    of O with the argument "length".
            // 3. Let len be ToUint32(lenValue).
            var len = O.length >>> 0;

            // 4. If IsCallable(callbackfn) is false, throw a TypeError exception.
            if (typeof callbackfn !== 'function') {
                throw new TypeError();
            }

            // 5. If thisArg was supplied, let T be thisArg; else let T be undefined.
            if (arguments.length > 1) {
                T = thisArg;
            }

            // 6. Let k be 0.
            k = 0;

            // 7. Repeat, while k < len
            while (k < len) {

                var kValue;

                // a. Let Pk be ToString(k).
                //   This is implicit for LHS operands of the in operator
                // b. Let kPresent be the result of calling the HasProperty internal 
                //    method of O with argument Pk.
                //   This step can be combined with c
                // c. If kPresent is true, then
                if (k in O) {

                    // i. Let kValue be the result of calling the Get internal method
                    //    of O with argument Pk.
                    kValue = O[k];

                    // ii. Let testResult be the result of calling the Call internal method
                    //     of callbackfn with T as the this value and argument list 
                    //     containing kValue, k, and O.
                    var testResult = callbackfn.call(T, kValue, k, O);

                    // iii. If ToBoolean(testResult) is false, return false.
                    if (!testResult) {
                        return false;
                    }
                }
                k++;
            }
            return true;
        };
    }

    if (typeof Object.assign != 'function') {
        // Must be writable: true, enumerable: false, configurable: true
        Object.defineProperty(Object, "assign", {
            value: function assign(target, varArgs) { // .length of function is 2
                'use strict';
                if (target == null) { // TypeError if undefined or null
                    throw new TypeError('Cannot convert undefined or null to object');
                }

                var to = Object(target);

                for (var index = 1; index < arguments.length; index++) {
                    var nextSource = arguments[index];

                    if (nextSource != null) { // Skip over if undefined or null
                        for (var nextKey in nextSource) {
                            // Avoid bugs when hasOwnProperty is shadowed
                            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
                                to[nextKey] = nextSource[nextKey];
                            }
                        }
                    }
                }
                return to;
            },
            writable: true,
            configurable: true
        });
    }
})(jQuery);