I’ve been working with case statements in Ruby, and I was having a difficult time getting it to do what I wanted.

Things I learned:

1. Case statements that take an argument after the case (ex: case SOME_VARIABLE) can’t take logic after the when part of the statement.

   Bad:

   case thingie
   when thingie.match(/some regex/)
   # something cool happens
   end
   

   Good:

   case thingie
   when "a perfectly boring string"
   # something cool happens
   end
   

2. Case statements that do not take an argument after the case CAN take logic after the when

   Good:

   case
   when thingie.match(/some regex/)
   # something cool happens
   end