Forum: Ruby help me understand (method 1 : 0)

I got this piece of code from "RSpec Book" page 85


    def exact_match_count(guess)
      (0..3).inject(0) do | count, index |
        count + (exact_match?(guess, index) ? 1 : 0)
      end
    end

But I don't quite understand

   ...) ? 1 : 0)

part.

Could anyone help me understand this?

soichi

is the ternary if operator..

just try these lines on irb:

print ( true ? '1. this part returned' : '2. this part not returned' )
print ( false ? '1. this part not returned' : '2. this part returned' )

> just try these lines on irb:
>
> print ( true ? '1. this part returned' : '2. this part not returned' )
> print ( false ? '1. this part not returned' : '2. this part returned' )

Thanks I see it now!

soichi