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

ArrowFunctionNoImpliedReturn

Even when an arrow function consists just of an expression, the return keyword must be explicitly written

ArrowFunctionRequiresFunctionKeyword

Arrow functions also require the keyword 'function'

CallbackParametersInCaller

Parameters of a callback function may be written as parameters of the caller function

FunctionAsValueWithParentheses

To use a function as a value, one needs to have parentheses after its name

FunctionOverloading

It is possible to create multiple functions with the same name but with different signatures

FunctionsCannotBeImmediatelyInvoked

Functions cannot be called in the expression in which they are defined

FunctionsMustBeNamed

Every function definition requires an associated name

NoFunctionCallsChaining

It is not allowed to chain function calls

NumberOfParametersMatchArguments

Functions must be called with the same number of arguments as defined in their signature