文件操作 - esnext.set.union.js
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文件: /usr/share/nodejs/core-js/modules/esnext.set.union.js
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'use strict'; var $ = require('../internals/export'); var getBuiltIn = require('../internals/get-built-in'); var aCallable = require('../internals/a-callable'); var anObject = require('../internals/an-object'); var speciesConstructor = require('../internals/species-constructor'); var iterate = require('../internals/iterate'); // `Set.prototype.union` method // https://github.com/tc39/proposal-set-methods $({ target: 'Set', proto: true, real: true, forced: true }, { union: function union(iterable) { var set = anObject(this); var newSet = new (speciesConstructor(set, getBuiltIn('Set')))(set); iterate(iterable, aCallable(newSet.add), { that: newSet }); return newSet; } });
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