CODEWITHSUNDEEP
scala
userx
userx

Reputation: 3773

Eclipse Compilation error - Type mismatch;found:Unit required Int in Scala

I am a newbie in scala and started out writing some code in Eclipse. I have three methods out of which second one complains with error mentioned in subject

  def add(b:Byte):Unit = sum+=b
  def add1(b:Byte):Int = sum+=b
  def add2(b:Byte):Int = sum

Why is the third method not complaining and while second method does ? The code I wanted to write was something like "add b to sum an return the new sum" as concisely as possible. So even after declaring a return type of Int in second method, why doesn't scala understand an implicit return in the second method while it does the same for third method ?

Upvotes: 0

Views: 197

Answers (1)

sepp2k
sepp2k

Reputation: 370407

The return type of += is Unit. So add1 implicitly returns what += returns and that's Unit.

Upvotes: 2

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