Gsub and sub for replacement in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to replace all occurrences of 'cat' with 'dog' in the string.

Ruby

text = "cat and cat"
new_text = text.[1]("cat", "dog")
puts new_text

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

Asub

Bswap

Creplace

Dgsub

Attempts:

3 left

💡 Hint

Common Mistakes

Using sub instead of gsub causes only the first 'cat' to be replaced.

The gsub method replaces all occurrences of the pattern in the string.

2fill in blank

medium

Complete the code to replace only the first occurrence of 'apple' with 'orange'.

Ruby

fruits = "apple, apple, apple"
new_fruits = fruits.[1]("apple", "orange")
puts new_fruits

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

Asub

Bgsub

Creplace

Dswap

Attempts:

3 left

💡 Hint

Common Mistakes

Using gsub replaces all occurrences instead of just the first.

The sub method replaces only the first occurrence of the pattern.

3fill in blank

hard

Fix the error in the code to replace all digits with '#' characters.

Ruby

text = "Phone: [phone]"
new_text = text.[1](/\d/, "#")
puts new_text

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

Asub

Bgsub

Creplace

Dswap

Attempts:

3 left

💡 Hint

Common Mistakes

Using sub replaces only the first digit, not all.

To replace all digits, use gsub with the digit pattern.

4fill in blank

hard

Fill both blanks to create a hash mapping words to their lengths, but only for words longer than 4 letters.

Ruby

words = ["apple", "cat", "banana", "dog"]
lengths = {word: word.[1] for word in words if word.[2] 4}
puts lengths

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

Alength

Bsize

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > causes wrong filtering.

Using size instead of length is valid but not the expected answer here.

Use length to get word length and > to filter words longer than 4.

5fill in blank

hard

Fill all three blanks to create a hash with uppercase words as keys and their lengths as values, only for words with length greater than 3.

Ruby

words = ["tree", "sun", "flower", "sky"]
result = {word.[1]: word.[2] for word in words if word.[3] 3}
puts result

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

Aupcase

Blength

C>

Ddowncase

Attempts:

3 left

💡 Hint

Common Mistakes

Using downcase instead of upcase changes keys incorrectly.

Using < instead of > filters wrong words.

Use upcase to uppercase keys, length for values, and > to filter words longer than 3.