Conditional key/value in a ruby hash

Question

Is there a nice (one line) way of writing a hash in ruby with some entry only there if a condition is fulfilled? I thought of

{:a => \'a\', :b => (\'b\         


        

Answer 1

From Ruby 1.9+, if you want to build a hash based on conditionals you can use tap, which is my new favourite thing. This breaks it onto multiple lines but is more readable IMHO:

{}.tap do |my_hash| 
  my_hash[:a] = 'a'
  my_hash[:b] = 'b' if condition
end