25 lines
727 B
JavaScript
25 lines
727 B
JavaScript
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/* eslint-disable no-extend-native, func-names, space-before-function-paren, semi, space-infix-ops, max-len */
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Array.prototype.first = function() {
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return this[0];
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}
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Array.prototype.last = function() {
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return this[this.length-1];
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}
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Array.prototype.find = Array.prototype.find || function(predicate, ...args) {
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if (!this) throw new TypeError('Array.prototype.find called on null or undefined');
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if (typeof predicate !== 'function') throw new TypeError('predicate must be a function');
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const list = Object(this);
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const thisArg = args[1];
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let value = {};
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for (let i = 0; i < list.length; i += 1) {
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value = list[i];
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if (predicate.call(thisArg, value, i, list)) return value;
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}
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return undefined;
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};
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