paste and paste0 in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to join the words with a space using paste.

R Programming

result <- paste("Hello", "World", sep=[1])
print(result)

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

A"-"

B","

C" "

D"_"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a comma or dash instead of a space as separator.

Forgetting to put the separator inside quotes.

The paste function joins strings with the separator given by sep. Using a space " " joins words with a space.

2fill in blank

medium

Complete the code to join the words without any separator using paste0.

R Programming

result <- paste0("Hello", [1], "World")
print(result)

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

A""

B" "

C", "

D"-"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a space or comma as separator with paste0.

Confusing paste and paste0 functions.

The paste0 function joins strings without any separator by default. Using an empty string "" explicitly means no separator.

3fill in blank

hard

Fix the error in the code to correctly join numbers and strings using paste.

R Programming

result <- paste("Age:", [1])
print(result)

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

A25

B"25"

Cc(25)

Das.character(25)

Attempts:

3 left

💡 Hint

Common Mistakes

Passing numbers directly without conversion.

Using quotes around numbers incorrectly.

To join numbers with strings using paste, convert numbers to characters with as.character(). This avoids unexpected output.

4fill in blank

hard

Fill both blanks to create a named vector where names are uppercase and values are joined strings.

R Programming

words <- c("apple", "banana", "cherry")
names(words) <- toupper(words)
result <- sapply(words, function(w) paste(w, [1], sep=[2])
print(result)

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

A"fruit"

B", "

C"-"

D" "

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong separator characters.

Not quoting the string to join.

The function joins each word with the string "fruit" using a comma and space separator ", ".

5fill in blank

hard

Fill all three blanks to create a vector of joined strings with no separator and uppercase names.

R Programming

words <- c("dog", "cat", "bird")
names(words) <- [1](words)
result <- sapply(words, function(w) paste0(w, [2], [3]))
print(result)

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

Atoupper

B"_"

C"pet"

Dtolower

Attempts:

3 left

💡 Hint

Common Mistakes

Using tolower instead of toupper.

Using paste instead of paste0.

Forgetting to quote strings.

The names are uppercase using toupper. The strings are joined with an underscore and the word "pet" using paste0 which has no separator.