I’m trying to provide a default value for a functi...

# getting-started

[Ellen Spertus]

I’m trying to provide a default value for a function parameter but have been unable to get the syntax right (and it’s hard to search for function parameters that are themselves functions). Could someone tell me how to correct this?

fun Payload.toString(errorReporter: (String) -> Unit = { (_: String) -> Unit } )String? { ... }

[Ellen Spertus]

I’m getting the “Declaration destructuring initializer” error.

[Ellen Spertus]

The default function should ignore its string argument. If someone wants to pass in a logger, they can.

[Shawn]

lambda parameters in parens are interpreted as destructured parameters

[Shawn]

remove the parens around _: String (and add the missing : after the closing paren of the argument list) and you’ll be golden

[Shawn]

https://kotlinlang.org/docs/reference/multi-declarations.html#destructuring-in-lambdas-since-11

[Ellen Spertus]

Thank you. Removing the parens did the trick. (I’m not sure where my colon went in the copy-paste.)