What is this hr = hr>=12 ? hr-12 : hr; means?
<p>I am practicing this <a href="https://developer.mozilla.org/en/Canvas_tutorial/Basic_animations" rel="nofollow">https://developer.mozilla.org/en/Canvas_tutorial/Basic_animations</a> Clock tutorial.
Everything in the code is clear to me. 
Accept this <code>hr = hr&gt;=12 ? hr-12 : hr;</code> is not clear me. May be i am write it's a <code>if else</code> statement.</p>

<p>Can any explain what this code is doing. </p>

<p>Thanks :)</p>
