As a new ruby developer, I’m constantly surprised by the little shortcuts and niceties of the language.
One technique I often see is to pass
&:symbol into an enumerable method, where
:symbol is a method on the object.
Behind the scenes, this is translating the
:upcase symbol into a Proc and passing it into the
map method which will run the Proc on each element in the enumberable.
The above code is equivalent to:
There are slight performance gains by writing the block explicitly, but I think the conciseness of the
&:symbol trick is worth the slight hit.
Edit: As further proof of my theory that RailsCasts provides all you need to know about Ruby and Rails, this trick was covered waaaay back in Episode 6