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Edit File: instanceof.js

// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

assertTrue({} instanceof Object);
assertTrue([] instanceof Object);

assertFalse({} instanceof Array);
assertTrue([] instanceof Array);

function TestChains() {
  var A = {};
  var B = {};
  var C = {};
  B.__proto__ = A;
  C.__proto__ = B;

function F() { }
  F.prototype = A;
  assertTrue(C instanceof F);
  assertTrue(B instanceof F);
  assertFalse(A instanceof F);

F.prototype = B;
  assertTrue(C instanceof F);
  assertFalse(B instanceof F);
  assertFalse(A instanceof F);

F.prototype = C;
  assertFalse(C instanceof F);
  assertFalse(B instanceof F);
  assertFalse(A instanceof F);
}

TestChains();

function TestExceptions() {
  function F() { }
  var items = [ 1, new Number(42),
                true,
                'string', new String('hest'),
                {}, [],
                F, new F(),
                Object, String ];

var exceptions = 0;
  var instanceofs = 0;

for (var i = 0; i < items.length; i++) {
    for (var j = 0; j < items.length; j++) {
      try {
        if (items[i] instanceof items[j]) instanceofs++;
      } catch (e) {
        assertTrue(e instanceof TypeError);
        exceptions++;
      }
    }
  }
  assertEquals(10, instanceofs);
  assertEquals(88, exceptions);

// Make sure to throw an exception if the function prototype
  // isn't a proper JavaScript object.
  function G() { }
  G.prototype = undefined;
  assertThrows("({} instanceof G)");
}

TestExceptions();

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