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36 lines
1014 B
XML
36 lines
1014 B
XML
<!DOCTYPE qhelp PUBLIC
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"-//Semmle//qhelp//EN"
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"qhelp.dtd">
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<qhelp>
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<overview>
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<p>
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Arithmetic comparisons with the special not-a-number value <code>NaN</code> are useless: nothing is considered
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to be equal to <code>NaN</code>, not even <code>NaN</code> itself, and similarly nothing is considered greater
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or less than <code>NaN</code>.
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</p>
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</overview>
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<recommendation>
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<p>
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Use the <code>isNaN</code> function from the standard library to determine whether a given value is <code>NaN</code>.
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</p>
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</recommendation>
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<example>
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<p>
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Instead of <code>x === NaN</code>, use <code>isNaN(x)</code>.
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</p>
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</example>
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<references>
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<li>Arvind Kumar: <a href="http://www.devarticles.in/javascript/javascript-common-mistake-of-comparing-variable-with-nan-and-not-with-isnan/">Javascript common mistake of comparing with NaN and not with isNaN</a>.</li>
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<li>Mozilla Developer Network: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN">NaN</a>.</li>
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</references>
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</qhelp>
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