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confused by javascript/angular code operator ||

 
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I'm trying to work through the AngularJS v1.2 tutorial. The task is to:

Add a method to GalleryController called setCurrent that accepts a value and assigns it to current. If no value is passed in, set current to 0.

The pertinent code in app.js



Here's the index.html that uses that GalleryController



I don't understand how || works on line 8. According to the MDN docs for Logical Operators I think this should set this.current to false if nothing is passed into it. I am confused. Can someone help me? Thanks.
 
Brian Jones Jr.
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I tested the following code in in JSFiddle, and it returned 0.  Why is this not returning false?

 
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