Function

A function produces a return value from a list of argument values.

Related concepts:  OperatorParameterArgumentReturnMethod

Closest Wikipedia entry:  Subroutine — In computer programming, a function (also procedure, method, subroutine, routine, or subprogram) is a callable unit of software logic that has a well-defined interface and behavior and can be invoked multiple times. Callable units provide a powerful programming tool. The primary purpose is to allow for the decomposition of a large and/or complicated problem into chunks that have relatively low cognitive load and to assign the chunks meaningful names (unless they are anonymous).

Misconceptions about Function

15 documented Misconceptions

DeferredReturn

A return statement in the middle of a function doesn't return immediately

MultipleValuesReturn

Functions can return multiple values

OutsideInFunctionNesting

Nested function calls are invoked outside in

ParenthesesOnlyIfArgument

() are optional for function calls without arguments

ReturnCall

Return statements need () around the return value