js/src/tests/test262/built-ins/Iterator/prototype/some/predicate-returns-falsey-then-truthy.js


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// |reftest| shell-option(--enable-iterator-helpers) skip-if(!this.hasOwnProperty('Iterator')||!xulRuntime.shell) -- iterator-helpers is not enabled unconditionally, requires shell-options
// Copyright (C) 2023 Michael Ficarra. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-iteratorprototype.some
description: >
  Iterator.prototype.some returns true and closes the iterator when the predicate returns falsey for some iterated values and truthy for others
info: |
  %Iterator.prototype%.some ( predicate )

features: [iterator-helpers]
flags: []
---*/
function* g() {
  for (let i = 0; i < 5; ++i) {
    yield i;
  }
}

let iter = g();

let predicateCalls = 0;
let result = iter.some(v => {
  ++predicateCalls;
  return v > 2;
});

assert.sameValue(result, true);
assert.sameValue(predicateCalls, 4);

let { done, value } = iter.next();
assert.sameValue(done, true);
assert.sameValue(value, undefined);

reportCompare(0, 0);