diff options
Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/map/15.4.4.19-9-12.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/map/15.4.4.19-9-12.js | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/map/15.4.4.19-9-12.js b/js/src/tests/test262/built-ins/Array/prototype/map/15.4.4.19-9-12.js new file mode 100644 index 0000000000..06631cb716 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/map/15.4.4.19-9-12.js @@ -0,0 +1,37 @@ +// 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.map +description: > + Array.prototype.map - returns an empty array if 'length' is 0 + (subclassed Array, length overridden with []) +---*/ + +function Foo() {} +Foo.prototype = [1, 2, 3]; +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() {} +var a = Array.prototype.map.call(f, cb); + +assert(Array.isArray(a), 'Array.isArray(a) !== true'); +assert.sameValue(a.length, 0, 'a.length'); + +reportCompare(0, 0); |