src/v8/test/mjsunit/array-join-nonarray-length-getter-side-effects.js

// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

(function Throws() {
  function TestError() {}

  let callCount = 0;
  const a = {
    0: 1,
    1: 2,
    get length() {
      callCount++;
      throw new TestError();
    }
  };
  assertThrows(() => Array.prototype.join.call(a), TestError);
  assertSame(1, callCount);

  // Verifies cycle detection still works properly after thrown error.
  Object.defineProperty(a, 'length', {
    get() {
      callCount++;
      return 2;
    }
  });
  assertSame('1,2', Array.prototype.join.call(a));
  assertSame(2, callCount);
})();