// Copyright (c) 2012 Ecma International. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- esid: sec-array.prototype.reduce description: > Array.prototype.reduce throws TypeError if 'length' is 0 (subclassed Array, length overridden with obj w/o valueOf (toString)), no initVal ---*/ 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() {} assert.throws(TypeError, function() { f.reduce(cb); }); reportCompare(0, 0);