'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;
|
};
|
