![]() ![]() The Unit return type cannot be omitted.įunction types can optionally have an additional receiver type, which is specified before the dot in the notation: the type A.(B) -> C represents functions that can be called on a receiver object A with a parameter B and return a value C. The list of parameter types may be empty, as in () -> A. These types have a special notation that corresponds to the signatures of the functions - their parameters and return values:Īll function types have a parenthesized list of parameter types and a return type: (A, B) -> C denotes a type that represents functions that take two arguments of types A and B and return a value of type C. Kotlin uses function types, such as (Int) -> String, for declarations that deal with functions: val onClick: () -> Unit =. Println("joinedToString = $joinedToString") Function references can also be used for higher-order function calls: Val joinedToString = items.fold("Elements:", ) Parameter types in a lambda are optional if they can be inferred: The last expression in a lambda is considered the return value: When a lambda has parameters, they go first, followed by '->' Lambdas are code blocks enclosed in curly braces.
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