esnext.iterator.as-indexed-pairs.js 769 B

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  1. 'use strict';
  2. // https://github.com/tc39/proposal-iterator-helpers
  3. var $ = require('../internals/export');
  4. var apply = require('../internals/function-apply');
  5. var anObject = require('../internals/an-object');
  6. var getIteratorDirect = require('../internals/get-iterator-direct');
  7. var createIteratorProxy = require('../internals/iterator-create-proxy');
  8. var IteratorProxy = createIteratorProxy(function (args) {
  9. var result = anObject(apply(this.next, this.iterator, args));
  10. var done = this.done = !!result.done;
  11. if (!done) return [this.index++, result.value];
  12. });
  13. $({ target: 'Iterator', proto: true, real: true, forced: true }, {
  14. asIndexedPairs: function asIndexedPairs() {
  15. return new IteratorProxy(getIteratorDirect(this), {
  16. index: 0
  17. });
  18. }
  19. });