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文件: /node_modules/core-js/internals/collection-from.js
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'use strict'; // https://tc39.github.io/proposal-setmap-offrom/ var aFunction = require('../internals/a-function'); var bind = require('../internals/function-bind-context'); var iterate = require('../internals/iterate'); module.exports = function from(source /* , mapFn, thisArg */) { var length = arguments.length; var mapFn = length > 1 ? arguments[1] : undefined; var mapping, A, n, boundFunction; aFunction(this); mapping = mapFn !== undefined; if (mapping) aFunction(mapFn); if (source == undefined) return new this(); A = []; if (mapping) { n = 0; boundFunction = bind(mapFn, length > 2 ? arguments[2] : undefined, 2); iterate(source, function (nextItem) { A.push(boundFunction(nextItem, n++)); }); } else { iterate(source, A.push, A); } return new this(A); };
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