Function
A function produces a return value from a list of argument values.
Related concepts: OperatorParameterArgumentReturnMethod
Closest Wikipedia entry: Subroutine
Misconceptions about Function15 documented Misconceptions
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ArrowFunctionNoImpliedReturn — JavaScript
Even when an arrow function consists just of an expression, the return keyword must be explicitly writtenArrowFunctionRequiresFunctionKeyword — JavaScript
Arrow functions also require the keyword 'function'CallbackParametersInCaller — JavaScript
Parameters of a callback function may be written as parameters of the caller functionDeferredReturn — Python
A return statement in the middle of a function doesn't return immediatelyFunctionAsValueWithParentheses — JavaScript
To use a function as a value, one needs to have parentheses after its nameFunctionOverloading — JavaScript
It is possible to create multiple functions with the same name but with different signaturesFunctionsCannotBeImmediatelyInvoked — JavaScript
Functions cannot be called in the expression in which they are definedFunctionsMustBeNamed — JavaScript
Every function definition requires an associated nameMultipleValuesReturn — Python
Functions can return multiple valuesNoFunctionCallsChaining — JavaScript
It is not allowed to chain function callsNumberOfParametersMatchArguments — JavaScript
Functions must be called with the same number of arguments as defined in their signatureOutsideInFunctionNesting — Python
Nested function calls are invoked outside inOutsideInMethodNesting — Java
Nested method calls are invoked outside inParenthesesOnlyIfArgument — Python
() are optional for function calls without argumentsReturnCall — Python
Return statements need () around the return value