CODEWITHSUNDEEP
scalapattern-matching
Dominic Bou-Samra
Dominic Bou-Samra

Reputation: 15414

Scala - pattern matching with conditional statements?

Is it possible to do something like:

def foo(x: Int): Boolean = {
    case x > 1 => true
    case x < 1 => false
}

Upvotes: 16

Views: 12355

Answers (3)

Madoc
Madoc

Reputation: 5919

Since the case of x == 1 is missing in your example, I assume that it is handled just the same as x < 1.

You can do it like this:

def foo(x:Int):Boolean = (x - 1).signum match {
  case 1 => true
  case _ => false
}

But then, this can of course be simplified a lot:

def foo(x:Int) = (x - 1).signum == 1

Upvotes: 0

michael.kebe
michael.kebe

Reputation: 11085

I would write something like this:

def foo(x: Int) = if (x > 1) true
                  else if (x < 1) false
                  else throw new IllegalArgumentException("Got " + x)

Upvotes: 2

dhg
dhg

Reputation: 52701

def foo(x: Int): Boolean = 
    x match {
        case _ if x > 1 => true
        case _ if x < 1 => false
    }

Note that you don't have a case for x == 1 though...

Upvotes: 27

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