On: Core Erlang by Example

[marci]

Close enough?

  case X of
    {Cat, N} when Cat == expense; Cat == invoice; Cat == loss  -> Total - N;
    {credit, N}  -> Total + N
  end

[klibertp → marci]

patrec said that

> you can sometimes ameliorate it with guards

which is exactly what you did, so I don't think you're disagreeing here :)