függvényaláírás

A függvényaláírás, or function signature in English, is a core concept in programming. It defines the identity of a function, specifying its name, the number and types of its parameters, and the type of value it returns. Essentially, it acts as a contract for how a function can be called and what to expect from it.

The name of the function is a crucial part of its signature, allowing developers to refer to and invoke it. The parameters, also known as arguments, are the pieces of data that a function receives. The signature details the expected data type for each parameter, ensuring that the function is used with the correct kind of input. For example, a function might expect an integer and a string, or two floating-point numbers.

Finally, the return type indicates the data type of the value that the function will produce and send back to the caller. This is important for understanding what kind of result to anticipate and how to process it. In some programming languages, the return type is a mandatory part of the signature, while in others, it might be inferred or optional. Understanding function signatures is fundamental for writing correct, maintainable, and understandable code, as it clarifies the interface between different parts of a program.