test/suite/ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-5-7.js


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/// Copyright (c) 2012 Ecma International.  All rights reserved. 
/// Ecma International makes this code available under the terms and conditions set
/// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the 
/// "Use Terms").   Any redistribution of this code must retain the above 
/// copyright and this notice and otherwise comply with the Use Terms.
/**
 * @path ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-5-7.js
 * @description Array.prototype.reduce throws TypeError if 'length' is 0 (subclassed Array, length overridden with obj w/o valueOf (toString)), no initVal
 */


function testcase() {
  foo.prototype = new Array(1, 2, 3);
  function foo() {}
  var f = new foo();
  
  var o = { toString: function () { return '0';}};
  f.length = o;
  
  // objects inherit the default valueOf method of the Object object;
  // that simply returns the itself. Since the default valueOf() method
  // does not return a primitive value, ES next tries to convert the object
  // to a number by calling its toString() method and converting the
  // resulting string to a number.

  function cb(){}
  try {
    f.reduce(cb);
  }
  catch (e) {
    if (e instanceof TypeError) {
      return true;
    }
  }
 }
runTestCase(testcase);