test/built-ins/Array/prototype/lastIndexOf/15.4.4.15-5-4.js


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// 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
es5id: 15.4.4.15-5-4
description: Array.prototype.lastIndexOf when fromIndex is undefined
---*/

  var a = new Array(1,2,1);

// undefined resolves to 0, no second argument resolves to len
assert.sameValue(a.lastIndexOf(2,undefined), -1, 'a.lastIndexOf(2,undefined)');
assert.sameValue(a.lastIndexOf(1,undefined), 0, 'a.lastIndexOf(1,undefined)');
assert.sameValue(a.lastIndexOf(1), 2, 'a.lastIndexOf(1)');