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

There's a lot of clever solutions in here, but IMO the simplest and therefore best approach is

hash = { a: 'a', b: 'b' }
hash[:c] = 'c' if condition

It goes against the OP's request of doing it in two lines, but really so do the other answers that only appear to be one-liners. Let's face it, this is the most trivial solution and it's easy to read.