How to do “late” string interpolation in Ruby

Question

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

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

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


        

Answer 1

Do you have to define the interpolation-bearing string outside of your Proc?

proc = Proc.new { |var| "#{var}" }
proc.call(123) # "123"

This would be the cleanest way I think.