esnext.set.intersection.js 897 B

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  1. 'use strict';
  2. var $ = require('../internals/export');
  3. var getBuiltIn = require('../internals/get-built-in');
  4. var call = require('../internals/function-call');
  5. var aCallable = require('../internals/a-callable');
  6. var anObject = require('../internals/an-object');
  7. var speciesConstructor = require('../internals/species-constructor');
  8. var iterate = require('../internals/iterate');
  9. // `Set.prototype.intersection` method
  10. // https://github.com/tc39/proposal-set-methods
  11. $({ target: 'Set', proto: true, real: true, forced: true }, {
  12. intersection: function intersection(iterable) {
  13. var set = anObject(this);
  14. var newSet = new (speciesConstructor(set, getBuiltIn('Set')))();
  15. var hasCheck = aCallable(set.has);
  16. var adder = aCallable(newSet.add);
  17. iterate(iterable, function (value) {
  18. if (call(hasCheck, set, value)) call(adder, newSet, value);
  19. });
  20. return newSet;
  21. }
  22. });