how can I do this ```when piece is { Pawn -> {} Bishop -> {} ... }``` as opposed to this ```if...

# getting-started

[Ray Rahke]

how can I do this

when piece is {
Pawn -> {}
Bishop -> {}
...
}

as opposed to this

if (piece is Pawn) {}
else if (piece is Bishop) {}

[ephemient]

when (piece) {
    is Pawn -> {}
    is Bishop -> {}

as documented… https://kotlinlang.org/docs/control-flow.html#when-expression

[Ray Rahke]

was hoping there was a less redundant way. but ill go with tis

[Arjan van Wieringen]

How is this redundant?

[Vampire]

How is this redundant?

He probably means repeating is

[Klitos Kyriacou]

If your Pawn, Bishop etc are object rather than class, you can leave out the is.

[Ray Rahke]

They're classes. You can have many instances of Pawns

[Ray Rahke]

He probably means repeating is

yeah

[kqr]

you can have other predicates, right?

[Ray Rahke]

yeah so ideally I would like the when construct to support a parameterized expression

[Ray Rahke]

a way to define a function one time in the expression, then have when apply it implicitly

[Ray Rahke]

when (piece) apply( (type) -> piece is type {
Pawn -> {} // implicitly do piece is Pawn
Bishop -> {}
}

[CLOVIS]

Isn't that more verbose than the current code?