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/* eslint-disable no-extend-native, no-bitwise, eqeqeq */ /** * Array.prototype.find polyfill * * Based on the example from the MDN docs, re-written for MW house style. * Implementation follows the spec here: * https://tc39.github.io/ecma262/#sec-array.prototype.find * * author Mozilla Contributors * license CC0 per https://developer.mozilla.org/en-US/docs/MDN/About#copyrights_and_licenses * * https://github.com/mdn/content/blob/b81aa721130/files/en-us/web/javascript/reference/global_objects/array/find/index.html#L113 */ if ( !Array.prototype.find ) { Object.defineProperty( Array.prototype, 'find', { value: function ( predicate ) { var o, len, thisArg, k, kValue; // 1. Let O be ? ToObject(this value). if ( this == null ) { throw new TypeError( '"this" is null or not defined' ); } o = Object( this ); // 2. Let len be ? ToLength(? Get(O, "length")). 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. thisArg = arguments[ 1 ]; // 5. Let k be 0. 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. kValue = o[ k ]; if ( predicate.call( thisArg, kValue, k, o ) ) { return kValue; } // e. Increase k by 1. k++; } // 7. Return undefined. return undefined; }, configurable: true, writable: true } ); }
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