CODEWITHSUNDEEP
kotlin
mancini0
mancini0

Reputation: 4703

Kotlin lambda syntax

In the below code, what is wrong with the second add?

val lambdas  = mutableListOf<()->Unit>()
lambdas.add{println("a")} // this compiles fine
lambdas.add{()->println("b")} //why can't I do this?


error: expecting a name
lambdas.add{{()->println("b")}}

Upvotes: 2

Views: 156

Answers (1)

ardenit
ardenit

Reputation: 3890

You can't declare a lambda the way you are trying to

val right: () -> Int = { 1 } // Convenient way to declare a lambda without parameters
val alsoRight: () -> Int = { -> 1 } // The right way to explicitly declare a lambda without parameters
val wrong: () -> Int = { () -> 1 } // The wrong way to declare a lambda without parameters

That line should look like this:

lambdas.add { -> println("b") }

Upvotes: 3

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