showcar-ui/src/js/polyfills/array.js

Showcar-ui is the pattern library that is used to build the frontend of AutoScout24. It provides CSS classes, custom elements and components.

// https://gist.github.com/brettz9/4212262
if (!Array.from) {
    Array.from = function (object) {
        'use strict';
        return [].slice.call(object);
    };
}

// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/of
if (!Array.of) {
    Array.of = function () {
        return Array.prototype.slice.call(arguments);
    };
}

// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/includes
if (!Array.prototype.includes) {
    Array.prototype.includes = function (searchElement /*, fromIndex*/ ) {
        'use strict';
        if (this == null) {
            throw new TypeError('Array.prototype.includes called on null or undefined');
        }

        var O = Object(this);
        var len = parseInt(O.length, 10) || 0;
        if (len === 0) {
            return false;
        }
        var n = parseInt(arguments[1], 10) || 0;
        var k;
        if (n >= 0) {
            k = n;
        } else {
            k = len + n;
            if (k < 0) {
                k = 0;
            }
        }
        var currentElement;
        while (k < len) {
            currentElement = O[k];
            if (searchElement === currentElement ||
                (searchElement !== searchElement && currentElement !== currentElement)) { // NaN !== NaN
                return true;
            }
            k++;
        }
        return false;
    };
}

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find#Polyfill
// https://tc39.github.io/ecma262/#sec-array.prototype.find
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;
        }
    });
}