Which of the following is optional when writing a function definition


Syntax

A function definition does not require a return type, but it can optionally include one. For example, consider the following valid function definitions:

The function keyword

The function keyword is optional when writing a function definition in JavaScript. However, if you omit the function keyword, the function will be treated as a variable and will not be executed.

A function name

A function name is not required when writing a function definition, but it is generally considered good practice to include one. A function name can be any valid identifier.

A list of parameters

A function definition may optionally include one or more lists of parameters. Each parameter in a list is separated by a comma.

The body of the function

When writing a function definition, the body of the function is optional. The body of the function is the code that the function will execute when it is called.

Parameters

Function definitions in Python have the following syntax:

Required parameters

Parameters are the names listed in the function definition. These are the values that will be passed to the function when it is called. Required parameters must be included in the function call, and they must be listed in the same order as they are listed in the function definition. Optional parameters can be included in the function call, but they do not have to be. If an optional parameter is not included, then a default value will be used.

Optional parameters

Parameters are the names listed in the function definition, which determine the order in which arguments are passed to the function when it is called. Each parameter must be assigned a value when the function is called, but some parameters can be given default values in the function definition. These default values will be used if no value is provided for that parameter when the function is called. Parameters that do not have default values must be specified when the function is called, otherwise an error will occur. Optional parameters are indicated by square brackets [ ] in the function definition, as shown below.

def my_function(param1, param2, [param3]):

The body of the function

Statements


The body of the function – (which of the following is optional when writing a function definition)

A function definition must include a:

-statements keyword

  • curly braces { }
  • semicolon ;

Statements are the commands that perform the actions in a function. They are executed in the order in which they appear. The semicolon at the end of each statement is optional, but including it makes your code easier to read.

The return keyword

The return keyword is optional when writing a function definition. If you do not use the return keyword, the function will return undefined.


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