Funktsioonitüübil

Funktsioonitüübil refers to the concept of function types in programming languages, particularly in the context of static typing. It describes the type signature of a function, which includes the types of its parameters and the type of its return value. Understanding function types is crucial for writing correct and maintainable code, as it allows the compiler or interpreter to verify that functions are being called with arguments of the expected types and that their results are used appropriately.

In languages that support function types, a function can be treated as a value. This means functions can be passed as arguments to other functions, returned as results from functions, and assigned to variables. The type of a variable that can hold a function will be a function type. For example, a function that takes an integer and returns a string might have the function type `(integer) -> string`.

This concept is closely related to higher-order functions, which are functions that operate on other functions, either by taking them as arguments or by returning them. Function types provide the formal mechanism to define and work with such functions safely. The precise syntax and capabilities for defining and using function types can vary significantly between different programming languages.