esnext.set.map.js 1.1 KB

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  1. 'use strict';
  2. var $ = require('../internals/export');
  3. var getBuiltIn = require('../internals/get-built-in');
  4. var bind = require('../internals/function-bind-context');
  5. var call = require('../internals/function-call');
  6. var aCallable = require('../internals/a-callable');
  7. var anObject = require('../internals/an-object');
  8. var speciesConstructor = require('../internals/species-constructor');
  9. var getSetIterator = require('../internals/get-set-iterator');
  10. var iterate = require('../internals/iterate');
  11. // `Set.prototype.map` method
  12. // https://github.com/tc39/proposal-collection-methods
  13. $({ target: 'Set', proto: true, real: true, forced: true }, {
  14. map: function map(callbackfn /* , thisArg */) {
  15. var set = anObject(this);
  16. var iterator = getSetIterator(set);
  17. var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
  18. var newSet = new (speciesConstructor(set, getBuiltIn('Set')))();
  19. var adder = aCallable(newSet.add);
  20. iterate(iterator, function (value) {
  21. call(adder, newSet, boundFunction(value, value, set));
  22. }, { IS_ITERATOR: true });
  23. return newSet;
  24. }
  25. });