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