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Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-8.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-8.js | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-8.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-8.js new file mode 100644 index 0000000000..cf499e8c88 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-4-8.js @@ -0,0 +1,31 @@ +// 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.lastindexof +description: > + Array.prototype.lastIndexOf returns -1 if 'length' is 0 (length is + an empty array) +---*/ + +// 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. +var i = Array.prototype.lastIndexOf.call({ + length: [] +}, 1); + + +assert.sameValue(i, -1, 'i'); + +reportCompare(0, 0); |