文件操作 - esnext.array.last-index.js
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文件: /usr/share/nodejs/core-js/modules/esnext.array.last-index.js
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'use strict'; // TODO: Remove from `core-js@4` var DESCRIPTORS = require('../internals/descriptors'); var addToUnscopables = require('../internals/add-to-unscopables'); var toObject = require('../internals/to-object'); var lengthOfArrayLike = require('../internals/length-of-array-like'); var defineBuiltInAccessor = require('../internals/define-built-in-accessor'); // `Array.prototype.lastIndex` getter // https://github.com/keithamus/proposal-array-last if (DESCRIPTORS) { defineBuiltInAccessor(Array.prototype, 'lastIndex', { configurable: true, get: function lastIndex() { var O = toObject(this); var len = lengthOfArrayLike(O); return len == 0 ? 0 : len - 1; } }); addToUnscopables('lastIndex'); }
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