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A function must include an interface and an implementation. In some programming languages the two may be declared separately, particularly if the language is declarative.
The interface typically consists of the function's return type followed by the function name and the type of its arguments, if any, usually enclosed in parenthesis (often round brackets). In untyped languages, the return type and the type of arguments may be optional, but the arguments must be formally named while the return value usually has the same name as the function. In typed languages the types must be specified but the names are optional unless the interface and implementation are combined.
In typed languages that support function overloading, the function name and the number and type of the arguments form the function's unambiguous signature. The signature also includes the constness of the function and its arguments where supported, but does not include the return type nor any argument default values that may be provided.
The function's implementation must duplicate the interface (if declared separately) but must also formally name the arguments. The function body is usually parenthesised (often in curly braces).
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