It's useful in all the cases where a blocks are useful in Ruby. It
simply saves typing out "(fn [])" and IMO makes the code look a little
cleaner.
eg.
(with_file "myfile.txt"
(write "asdf")
(close))
compared to.
(with_file "myfile.txt"
(fn []
(write "asdf")
(close)))
There's arguably no difference. I just prefer the first one.
-Patrick
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