How do I escape #{ from string interpolation
-
19-09-2019 - |
Question
I have a heredoc where I am using #{}
to interpolate some other strings, but there is an instance where I also want to write the actual text #{some_ruby_stuff}
in my heredoc, WITHOUT it being interpolated. Is there a way to escape the #{.
I've tried "\", but no luck. Although it escapes the #{}
, it also includes the "\":
>> <<-END
#{RAILS_ENV} \#{RAILS_ENV}
END
=> " development \#{RAILS_ENV}\n"
Solution
I think the backslash-hash is just Ruby being helpful in some irb-only way.
>> a,b = 1,2 #=> [1, 2]
>> s = "#{a} \#{b}" #=> "1 \#{b}"
>> puts s #=> 1 #{b}
>> s.size #=> 6
So I think you already have the correct answer.
OTHER TIPS
For heredoc without having to hand-escape all your potential interpolations, you can use single-quote-style-heredoc. It works like this:
item = <<-'END'
#{code} stuff
whatever i want to say #{here}
END
You can use '
quotes instead. Anything enclosed in them is not being interpolated.
Your solution with escaping #
also works for me. Indeed Ruby interpreter shows
=> "\#{anything}"
but
> puts "\#{anything}"
#{anything}
=> nil
Your string includes exactly what you wanted, only p
method shows it with escape characters. Actually, p
method shows you, how string should be written to get exactly object represented by its parameter.