CODEWITHSUNDEEP
scala
Saar
Saar

Reputation: 1803

Scala newbie - if-else

A scala method gets an input and should operate either on the input directly or a calculation of it, for instance consider the following code:

def foo (b : Boolean, input : Any): Unit ={
  val changedInput = {if (b) input else bar(input) }
  dowork (changedInput)
}

Is it appropriate to use an anonymous function like in the example above or there another syntax?

Upvotes: 0

Views: 82

Answers (3)

Nagarjuna Pamu
Nagarjuna Pamu

Reputation: 14825

This {} is used for multiline code block and are optional for one line code. Anonymous function in Scala looks like this val square = { x: Int => x * x }

def foo (b : Boolean, input : Any): Unit = {
  val changedInput = if (b) input else bar(input)
  dowork (changedInput)
}

Upvotes: 0

Lifu Huang
Lifu Huang

Reputation: 12848

There is no anonymous function in your example. And the code you write, IMO, is just fine.

I guess you regard {if (b) input else bar(input) } as anonymous function. It is called "block" in scala, which is just a expression whose value is the last expression contained in the block. For instance,

The value of { expr1; expr2; expr3} is the value of expr3. So your code can just be written as 

def foo (b : Boolean, input : Any): Unit ={
  val changedInput = if (b) input else bar(input)
  dowork (changedInput)
}

since there is only one expression in your block.

Upvotes: 4

Chris Martin
Chris Martin

Reputation: 30746

def foo(b: Boolean, input: Any): Unit =
  dowork(if (b) input else bar(input))

Upvotes: 0

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