How to do “late” string interpolation in Ruby

Question

>> string = \'#{var}\'
=> \"\\#{var}\"

>> proc = Proc.new { |var| string }
=> #

>> proc.call(123)
=> \"\\         


        

Answer 1

It works with eval:

proc = Proc.new { |var| eval(%Q{"#{string}"}) }

(If you trust the value of string.)