Changing every value in a hash in Ruby

Question

I want to change every value in a hash so as to add '%' before and after the value so

{ :a=>'a' , :b=>'b' } 

must be changed to

{ :a=>'%a%' , :b=>'%b%' } 

What's the best way to do this?

Answer 1

In Ruby 2.1 and higher you can do

{ a: 'a', b: 'b' }.map { |k, str| [k, "%#{str}%"] }.to_h