#{} inside double quoted strings lets you include variables in
strings. Like this:
irb(main):001:0> a = 1
=> 1
irb(main):004:0> "a = #{a}"
=> "a = 1"
I just performed a google search for #{} and "#{}" (without quotes and
with quotes) and got very interesting results. No match. I do not
think I have ever seen it before. :)
After a quick test, it looks to me that all queries including only
punctuation result in no match. Interesting.
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