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  1. 'use strict';
  2. var $ = require('../internals/export');
  3. var call = require('../internals/function-call');
  4. var aCallable = require('../internals/a-callable');
  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 callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
  9. var IS_PURE = require('../internals/is-pure');
  10. var IteratorProxy = createIteratorProxy(function () {
  11. var iterator = this.iterator;
  12. var predicate = this.predicate;
  13. var next = this.next;
  14. var result, done, value;
  15. while (true) {
  16. result = anObject(call(next, iterator));
  17. done = this.done = !!result.done;
  18. if (done) return;
  19. value = result.value;
  20. if (callWithSafeIterationClosing(iterator, predicate, [value, this.counter++], true)) return value;
  21. }
  22. });
  23. // `Iterator.prototype.filter` method
  24. // https://github.com/tc39/proposal-iterator-helpers
  25. $({ target: 'Iterator', proto: true, real: true, forced: IS_PURE }, {
  26. filter: function filter(predicate) {
  27. anObject(this);
  28. aCallable(predicate);
  29. return new IteratorProxy(getIteratorDirect(this), {
  30. predicate: predicate
  31. });
  32. }
  33. });