CODEWITHSUNDEEP
scala
user1377000
user1377000

Reputation: 1473

How to return in anonymous function/function literal?

I'm not sure how to use the return keyword in an anonymous function (or perhaps I should solve my problem in a different way?).

The way it is right now, the return actually refers to the enclosing function.

()=>{
  if (someMethodThatReturnsBoolean()) return true
  // otherwise do stuff here
}:Boolean

Upvotes: 0

Views: 280

Answers (2)

Régis Jean-Gilles
Régis Jean-Gilles

Reputation: 32719

The way it is right now, the return actually refers to the enclosing function.

This is how it is supposed to be. You cannot use return for returning from an anonymous function. You'll have to rewrite your code to avoid the return statement, as in:

()=>{
  if (someMethodThatReturnsBoolean()) true
  else {
    // otherwise do stuff here
  }
}:Boolean

Upvotes: 4

Marius Danila
Marius Danila

Reputation: 10411

Why not ?

() =>
  someMethodThatReturnsBoolean() || {
    //do stuff here that eventually returns a boolean
  }

Or, if you don't like to produce side effects with the || operator you can just use plain if:

() =>
  if (someMethodThatReturnsBoolean())
    true
  else {
    //do something here that returns boolean eventually
  }

if is just an expression in Scala and you should organize your code in an expression-like fashion and avoid return as much as possible.

Upvotes: 5

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