Default argument values in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a function with a default argument value.

R Programming

greet <- function(name = [1]) {
  paste("Hello", name)
}

Drag options to blanks, or click blank then click option'

A"World"

BWorld

Cname

D"name"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the default string value.

Using a variable name without quotes as default.

The default value for the argument name should be a string, so it must be enclosed in quotes.

2fill in blank

medium

Complete the code to call the function without providing the argument, so it uses the default value.

R Programming

greet([1])

Drag options to blanks, or click blank then click option'

A"Alice"

B(no argument)

Cname = "Alice"

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Passing an empty string instead of no argument.

Trying to pass the argument name without a value.

Calling the function without any argument uses the default value.

3fill in blank

hard

Fix the error in the function definition by completing the default argument value correctly.

R Programming

multiply <- function(x, y = [1]) {
  x * y
}

Drag options to blanks, or click blank then click option'

A2

B"2"

Cy

Dx

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers for default numeric arguments.

Using variable names as default values.

The default value should be a number, not a string or variable name.

4fill in blank

hard

Fill both blanks to create a function with two default arguments and return their sum.

R Programming

add <- function(a = [1], b = [2]) {
  a + b
}

Drag options to blanks, or click blank then click option'

A1

B0

C2

D"0"

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of numbers for default values.

Using the same value for both defaults.

The function has two default numeric arguments: a defaults to 0 and b defaults to 2.

5fill in blank

hard

Fill all three blanks to define a function with default arguments and call it with one argument.

R Programming

power <- function(base = [1], exponent = [2]) {
  base ^ exponent
}

result <- power([3])
result

Drag options to blanks, or click blank then click option'

A2

B3

C5

Dbase = 5

Attempts:

3 left

💡 Hint

Common Mistakes

Passing argument with name when only value is needed.

Mixing up base and exponent values.

The function defaults to base=2 and exponent=3. Calling power(5) sets base=5 and uses default exponent=3.