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    <p>It is the <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Operators/Special_Operators" rel="nofollow noreferrer">conditional</a> operator, it is equivalent to something like this:</p> <pre><code>if (pattern.Gotoccurance.score != null) { pattern.Gotoccurance.score; } else { '0'; } </code></pre> <p>But I think that an assignment statement is missing in the code you posted, like this:</p> <pre><code>var score = pattern.Gotoccurance.score !=null ? pattern.Gotoccurance.score : '0'; </code></pre> <p>The <code>score</code> variable will be assigned if <code>pattern.Gotoccurance.score</code> is not null:</p> <pre><code>var score; if (pattern.Gotoccurance.score != null) { score = pattern.Gotoccurance.score; } else { score = '0'; } </code></pre> <p>A common pattern to do this kind of 'default value' assignments in JavaScript is to use the logical OR operator (<code>||</code>) :</p> <pre><code>var score = pattern.Gotoccurance.score || '0'; </code></pre> <p>The value of <code>pattern.Gotoccurance.score</code> will be assigned to the <code>score</code> variable only if that value is not <em>falsy</em> (falsy values are <code>false</code>, <code>null</code>, <code>undefined</code>, <code>0</code>, zero-length string or <code>NaN</code>).</p> <p>Otherwise, if it's falsy <code>'0'</code> will be assigned.</p> <p><strong>Update:</strong> The performance will be equivalent, you should focus on readability, I try to use the ternary operator on expressions that are very simple, and you can also improve the formatting, splitting it up in two lines to make it more readable:</p> <pre><code>var status = (age &gt;= 18) ? "adult" : "minor"; </code></pre> <p>Related question:</p> <ul> <li><a href="https://stackoverflow.com/questions/160218/to-ternary-or-not-to-ternary">To Ternary or Not To Ternary?</a></li> </ul>
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    1. COOh, ok gr8, why need for this sort of coding, is this more efficient or just shortened version with same efficiency?
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      1. USGandalf StormCrow
    2. CODoes the interpretation time affect performance?
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    3. COThis is the kind of answer that makes a difference. No more doubt when it comes to JavaScript and the ternary operator. Well done CMS.
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      1. USLeniel Maccaferri
 

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