jerryscript/tests/jerry/to-length.js

// Copyright JS Foundation and other contributors, http://js.foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

function compareArray(a, b) {
  if (b.length !== a.length) {
    return false;
  }

  for (var i = 0; i < a.length; i++) {
    if (b[i] !== a[i]) {
      return false;
    }
  }
  return true;
}

// concat
(function() {
  try {
    Array.prototype.concat.call({}, {[Symbol.isConcatSpreadable]: true, length : 2 **53 - 1})
    assert(false);
  } catch (e) {
    assert(e instanceof TypeError);
  }

  try {
    Array.prototype.concat.call([1, 2, 3, 4], {[Symbol.isConcatSpreadable]: true, length : 2 **53 - 4})
    assert(false);
  } catch (e) {
    assert(e instanceof TypeError);
  }
})();

// fill
(function() {
  var obj = { length: 2 ** 53 - 1, [2 ** 53 - 5] : 'foo'}
  Array.prototype.fill.call(obj, 'bar', 2 ** 53 - 5)

  assert(obj[2 ** 53 - 5] === 'bar');
  assert(obj[2 ** 53 - 4] === 'bar');
  assert(obj[2 ** 53 - 3] === 'bar');
  assert(obj[2 ** 53 - 2] === 'bar');

  obj = { length: 2 ** 53 + 2, [2 ** 53 - 2] : 'foo'}
  Array.prototype.fill.call(obj, 'bar', 2 ** 53 - 2)

  assert(obj[2 ** 53 - 2] === 'bar');
  assert(obj[2 ** 53 - 1] === undefined);
})();

// includes
(function() {
  var obj = { length: 2 ** 53 - 1, [2 ** 53 - 5] : 'foo'}
  assert(Array.prototype.includes.call(obj, 'foo', 2 ** 53 - 10) === true);

  var obj = { length: 2 ** 53 - 1, [2 ** 53 + 5] : 'foo'}
  assert(Array.prototype.includes.call(obj, 'foo', 2 ** 53 - 10) === false);
})();

// indexOf
(function() {
  var obj = { length: 2 ** 53 - 1, [2 ** 53 - 5] : 'foo'}
  assert(Array.prototype.indexOf.call(obj, 'foo', 2 ** 53 - 10) === 2 ** 53 - 5);

  var obj = { length: 2 ** 53 - 1, [2 ** 53 + 5] : 'foo'}
  assert(Array.prototype.indexOf.call(obj, 'foo', 2 ** 53 - 10) === -1);
})();

// lastIndexOf
(function() {
  var obj = { length: 2 ** 53 - 1, [2 ** 53 - 5] : 'foo', [2 ** 53 - 6] : 'foo'}
  assert(Array.prototype.lastIndexOf.call(obj, 'foo', 2 ** 53 - 2) === 2 ** 53 - 5);

  var obj = { length: 2 ** 53 - 1, [2 ** 53 - 5] : 'foo', [2 ** 53 - 6] : 'foo'}
  assert(Array.prototype.lastIndexOf.call(obj, 'foo', 10) === -1);
})();


// pop
(function() {
  var obj = { length: 2 ** 53 - 1, [2 ** 53 - 2] : 'foo', [2 ** 53 - 3] : 'bar'}
  assert(Array.prototype.pop.call(obj) === 'foo');
  assert(obj.length === 2 ** 53 - 2);

  assert(Array.prototype.pop.call(obj) === 'bar');
  assert(obj.length === 2 ** 53 - 3);
})();

// push
(function() {
  var obj = { length: 2 ** 53 - 1 };
  try {
    Array.prototype.push.call(obj, 'foo');
    assert(false);
  } catch (e) {
    assert(e instanceof TypeError);
  }

  var obj = { length: 2 ** 53 - 2, [2 ** 53 - 3] : 'foo'}

  assert(Array.prototype.push.call(obj, 'bar') === 2 ** 53 - 1);
  assert(obj.length === 2 ** 53 - 1);
})();

// slice
(function() {
  var obj = { length: 2 ** 53 - 1, [2 ** 53 - 5] : 'foo', [2 ** 53 - 2] : 'bar'};
  var sliced = Array.prototype.slice.call(obj, 2 ** 53 - 10);
  assert(compareArray(sliced, [,,,,,'foo',,,'bar']));

  var sliced = Array.prototype.slice.call(obj, 2 ** 53 - 8, 2 ** 53 - 4);
  assert(compareArray(sliced, [,,,'foo',]));
})();

// splice
(function() {
  var obj = { length: 2 ** 53 - 1, [2 ** 53 - 5] : 'foo', [2 ** 53 - 2] : 'bar'};
  var spliced = Array.prototype.splice.call(obj, 2 ** 53 - 10, 5, '1', '2', '3', '4');
  assert(compareArray(spliced, [,,,,,]));
  assert(obj.length === 2 ** 53 - 2);
  assert(obj[2 ** 53 - 3] === 'bar');
  assert(obj[2 ** 53 - 6] === 'foo');
  assert(obj[2 ** 53 - 7] === '4');
  assert(obj[2 ** 53 - 8] === '3');
  assert(obj[2 ** 53 - 9] === '2');
  assert(obj[2 ** 53 - 10] === '1');
})();

// unshift
(function() {
  var obj = { length: 2 ** 53 - 1 };
  try {
    Array.prototype.unshift.call(obj, 'foo');
    assert(false);
  } catch (e) {
    assert(e instanceof TypeError);
  }
})();