Scala: type mismatch; found : Unit required: Boolean

Question

Hi I\'m just trying out my first bits of scala and have hit this error which I don\'t understand. I\'ve been trying to work it out and have exhausted my ideas. Help?

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Answer 1

You have to have an else clause, otherwise the type checker doesn't know what the return type is when it's not the case that count<0.

def calculate(count: Int): Boolean =    
  if (count<0) false
  else true

Or, better yet, you don't need the if-statement at all:

def calculate(count: Int) = count >= 0