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| |
| |
| ES5Harness.registerTest( { |
| id: "15.4.4.22-7-8", |
| |
| path: "TestCases/chapter15/15.4/15.4.4/15.4.4.22/15.4.4.22-7-8.js", |
| |
| description: "Array.prototype.reduceRight returns initialValue if 'length' is 0 and initialValue is present (subclassed Array, length overridden with [])", |
| |
| 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 { |
| if(f.reduceRight(cb,1) === 1) |
| return true; |
| } |
| catch (e) { } |
| }, |
| |
| precondition: function prereq() { |
| return fnExists(Array.prototype.reduceRight); |
| } |
| }); |