test/built-ins/Array/prototype/indexOf/15.4.4.14-9-10.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.

/*---
info: |
    note that prior to the finally ES5 draft SameValue was used for comparisions
    and hence NaNs could be found using indexOf *
esid: sec-array.prototype.indexof
es5id: 15.4.4.14-9-10
description: Array.prototype.indexOf must return correct index (NaN)
---*/

var _NaN = NaN;
var a = new Array("NaN", undefined, 0, false, null, {
  toString: function() {
    return NaN
  }
}, "false", _NaN, NaN);

assert.sameValue(a.indexOf(NaN), -1, 'NaN is equal to nothing, including itself.');