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27 lines
891 B
27 lines
891 B
'use strict';
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var aSet = require('../internals/a-set');
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var SetHelpers = require('../internals/set-helpers');
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var clone = require('../internals/set-clone');
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var size = require('../internals/set-size');
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var getSetRecord = require('../internals/get-set-record');
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var iterateSet = require('../internals/set-iterate');
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var iterateSimple = require('../internals/iterate-simple');
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var has = SetHelpers.has;
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var remove = SetHelpers.remove;
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// `Set.prototype.difference` method
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// https://github.com/tc39/proposal-set-methods
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module.exports = function difference(other) {
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var O = aSet(this);
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var otherRec = getSetRecord(other);
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var result = clone(O);
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if (size(O) <= otherRec.size) iterateSet(O, function (e) {
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if (otherRec.includes(e)) remove(result, e);
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});
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else iterateSimple(otherRec.getIterator(), function (e) {
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if (has(O, e)) remove(result, e);
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});
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return result;
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};
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