文件操作 - esnext.array.last-item.js
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文件: /node_modules/core-js/modules/esnext.array.last-item.js
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'use strict'; var DESCRIPTORS = require('../internals/descriptors'); var addToUnscopables = require('../internals/add-to-unscopables'); var toObject = require('../internals/to-object'); var toLength = require('../internals/to-length'); var defineProperty = require('../internals/object-define-property').f; // `Array.prototype.lastIndex` accessor // https://github.com/keithamus/proposal-array-last if (DESCRIPTORS && !('lastItem' in [])) { defineProperty(Array.prototype, 'lastItem', { configurable: true, get: function lastItem() { var O = toObject(this); var len = toLength(O.length); return len == 0 ? undefined : O[len - 1]; }, set: function lastItem(value) { var O = toObject(this); var len = toLength(O.length); return O[len == 0 ? 0 : len - 1] = value; } }); addToUnscopables('lastItem'); }
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