96 lines
2.4 KiB
JavaScript
96 lines
2.4 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @polyfill
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* @nolint
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*/
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/* eslint-disable no-bitwise, no-extend-native, radix, no-self-compare */
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex
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function findIndex(predicate, context) {
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if (this == null) {
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throw new TypeError(
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'Array.prototype.findIndex called on null or undefined',
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);
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}
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if (typeof predicate !== 'function') {
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throw new TypeError('predicate must be a function');
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}
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var list = Object(this);
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var length = list.length >>> 0;
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for (var i = 0; i < length; i++) {
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if (predicate.call(context, list[i], i, list)) {
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return i;
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}
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}
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return -1;
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}
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if (!Array.prototype.findIndex) {
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Object.defineProperty(Array.prototype, 'findIndex', {
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enumerable: false,
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writable: true,
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configurable: true,
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value: findIndex,
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});
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
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if (!Array.prototype.find) {
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Object.defineProperty(Array.prototype, 'find', {
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enumerable: false,
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writable: true,
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configurable: true,
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value: function(predicate, context) {
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if (this == null) {
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throw new TypeError('Array.prototype.find called on null or undefined');
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}
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var index = findIndex.call(this, predicate, context);
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return index === -1 ? undefined : this[index];
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},
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});
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes
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if (!Array.prototype.includes) {
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Object.defineProperty(Array.prototype, 'includes', {
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enumerable: false,
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writable: true,
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configurable: true,
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value: function(searchElement) {
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var O = Object(this);
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var len = parseInt(O.length) || 0;
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if (len === 0) {
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return false;
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}
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var n = parseInt(arguments[1]) || 0;
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var k;
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if (n >= 0) {
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k = n;
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} else {
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k = len + n;
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if (k < 0) {
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k = 0;
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}
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}
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var currentElement;
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while (k < len) {
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currentElement = O[k];
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if (
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searchElement === currentElement ||
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(searchElement !== searchElement && currentElement !== currentElement)
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) {
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return true;
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}
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k++;
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}
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return false;
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},
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});
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}
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