Default argument values in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a default argument value in R functions?

A default argument value is a value assigned to a function parameter that is used if no value is provided when the function is called.

beginner

How do you define a default argument value in an R function?

You assign a value to the parameter in the function definition, like function(x = 5) where 5 is the default value.

beginner

What happens if you call a function without providing a value for a parameter that has a default value?

The function uses the default value assigned to that parameter.

intermediate

Can default argument values depend on other arguments in the same function in R?

Yes, but only if the other arguments appear before the one with the default value, because R evaluates defaults in order.

beginner

Why are default argument values useful in R programming?

They make functions easier to use by providing common values automatically, so you don't have to specify every argument every time.

How do you specify a default value for an argument in an R function?

A By calling the function with a value

B By assigning a value inside the function body

C By assigning a value in the function definition, like <code>function(x = 10)</code>

D By using the <code>default()</code> function

Default values are set in the function definition by assigning a value to the parameter.

What value does a function use if you do not provide an argument that has a default value?

A Zero

B The default value specified in the function definition

C An error is thrown

D NULL

If no argument is provided, the function uses the default value defined for that parameter.

Can default argument values in R depend on other arguments in the same function?

A Yes, if the other arguments come before in the parameter list

B No, default values must be constants

C Yes, but only if they are global variables

D No, default values cannot depend on anything

Default values can depend on earlier arguments because R evaluates defaults in order.

What happens if you provide a value for an argument that has a default value?

A The function ignores the argument

B The default value is always used

C An error occurs

D The provided value overrides the default

When you provide a value, it replaces the default value for that call.

Why might you want to use default argument values in your functions?

A To make functions easier to call with common values

B To make functions run faster

C To prevent users from passing arguments

D To make functions only work with one value

Default values simplify function calls by providing common values automatically.

Explain how default argument values work in R functions and why they are useful.

Think about what happens when you call a function without some arguments.

Describe how default argument values can depend on other arguments in R and what rules apply.

Consider the order of parameters in the function definition.