Short circuit

Yesterday I remembered the following code:

navigator.getUserMedia = navigator.getUserMedia
|| navigator.webkitGetUserMedia
|| navigator.mozGetUserMedia
|| navigator.msGetUserMedia;

I couldn’t understand how it works, I mean shouldn’t it be something like this:

if (!navigator.getUserMedia)
if (navigator.webkitGetUserMedia){
navigator.getUserMedia = navigator.webkitGetUserMedia;}
if (navigator.mozGetUserMedia){
navigator.getUserMedia = navigator.mozGetUserMedia;}
{if (navigator.msGetUserMedia)
navigator.getUserMedia = navigator.msGetUserMedia;}

After some research Short circuit evaluation came up. So this code actually performs the task in a more elegant way. Now I have more reading to do because Python has short circuit evaluation also.


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