Ruby - How to output "#{}" in a string?

Question

Ruby uses the following characters #{} for string interpolation. If, for some reason, I would like to output those characters in a string, how would I do so?

Answer 1

Just use single quote:

puts '#{}'

Or if you want to use double quote, then escape it.

puts "\#{some_var} will be #{some_var}"

Answer 2

Single quotation will of course work, but what if you want to include them in string too and don't want to escape anything inside it? Use custom delimiter like that:

2.0.0p353 :001 > %q['"#{foo}[f]] #or e.g. %q&'"#{foo}[f]& 
 => "'\"\#{foo}[f]"

%q is the equivalent of single quotes and %Q is for double quotes.