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