blob: a0ae03e60798c1ae65f5373246577d519d08fd3a [file] [log] [blame]
/// Copyright (c) 2009 Microsoft Corporation
///
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/// that the following conditions are met:
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/// the following disclaimer.
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/// * Neither the name of Microsoft nor the names of its contributors may be used to
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///
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ES5Harness.registerTest( {
id: "15.4.4.21-5-8",
path: "TestCases/chapter15/15.4/15.4.4/15.4.4.21/15.4.4.21-5-8.js",
description: "Array.prototype.reduce throws TypeError if 'length' is 0 (subclassed Array, length overridden with []), no initVal",
test: function testcase() {
foo.prototype = new Array(1, 2, 3);
function foo() {}
var f = new foo();
f.length = [];
// 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.
//
// The toString( ) method on Array converts the array elements to strings,
// then returns the result of concatenating these strings, with commas in
// between. An array with no elements converts to the empty string, which
// converts to the number 0. If an array has a single element that is a
// number n, the array converts to a string representation of n, which is
// then converted back to n itself. If an array contains more than one element,
// or if its one element is not a number, the array converts to NaN.
function cb(){}
try {
f.reduce(cb);
}
catch (e) {
if (e instanceof TypeError) {
return true;
}
}
},
precondition: function prereq() {
return fnExists(Array.prototype.reduce);
}
});