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'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;
  }
});