Edit File: _set-collection-from.js
'use strict'; // https://tc39.github.io/proposal-setmap-offrom/ var $export = require('./_export'); var aFunction = require('./_a-function'); var ctx = require('./_ctx'); var forOf = require('./_for-of'); module.exports = function (COLLECTION) { $export($export.S, COLLECTION, { from: function from(source /* , mapFn, thisArg */) { var mapFn = arguments[1]; var mapping, A, n, cb; aFunction(this); mapping = mapFn !== undefined; if (mapping) aFunction(mapFn); if (source == undefined) return new this(); A = []; if (mapping) { n = 0; cb = ctx(mapFn, arguments[2], 2); forOf(source, false, function (nextItem) { A.push(cb(nextItem, n++)); }); } else { forOf(source, false, A.push, A); } return new this(A); } }); };
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