--- /dev/null
+'use strict';
+var $ = require('../internals/export');
+var IS_PURE = require('../internals/is-pure');
+var getBuiltIn = require('../internals/get-built-in');
+var anObject = require('../internals/an-object');
+var aFunction = require('../internals/a-function');
+var speciesConstructor = require('../internals/species-constructor');
+var iterate = require('../internals/iterate');
+
+// `Set.prototype.difference` method
+// https://github.com/tc39/proposal-set-methods
+$({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
+ difference: function difference(iterable) {
+ var set = anObject(this);
+ var newSet = new (speciesConstructor(set, getBuiltIn('Set')))(set);
+ var remover = aFunction(newSet['delete']);
+ iterate(iterable, function (value) {
+ remover.call(newSet, value);
+ });
+ return newSet;
+ }
+});