Bang methods (ending with !) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to use the bang method that reverses the string in place.

Ruby

str = "hello"
str.[1]

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

Areverse

Breverse!

Cupcase

Dcapitalize

Attempts:

3 left

💡 Hint

Common Mistakes

Using the non-bang method reverse which returns a new string but does not modify the original.

Using unrelated methods like upcase or capitalize.

The reverse! method reverses the string in place, modifying the original string.

2fill in blank

medium

Complete the code to remove trailing whitespace from the string using a bang method.

Ruby

text = "hello   "
text.[1]

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

Astrip!

Bstrip

Cchomp

Dchomp!

Attempts:

3 left

💡 Hint

Common Mistakes

Using strip which returns a new string but does not change the original.

Using chomp which removes newline characters, not whitespace.

The strip! method removes leading and trailing whitespace in place, modifying the original string.

3fill in blank

hard

Fix the error by choosing the correct bang method to convert the string to uppercase in place.

Ruby

name = "alice"
name = name.[1]

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

Aupcase

Bcapitalize!

Cupcase!

Dcapitalize

Attempts:

3 left

💡 Hint

Common Mistakes

Using upcase which returns a new string but does not modify the original.

Using capitalize! which only capitalizes the first letter.

The upcase! method converts the string to uppercase in place. It returns nil if no changes are made, so assigning back is usually unnecessary.

4fill in blank

hard

Fill both blanks to remove all exclamation marks from the string in place and then reverse it in place.

Ruby

msg = "Wow!!!"
msg.[1]("!")
msg.[2]

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

Adelete!

Bdelete

Creverse!

Dreverse

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-bang methods which do not modify the original string.

Using delete without the bang, which returns a new string.

delete! removes specified characters from the string in place. Then reverse! reverses the string in place.

5fill in blank

hard

Fill all three blanks to replace 'cat' with 'dog' in place, then upcase the string in place, and finally remove trailing spaces in place.

Ruby

sentence = "the cat is cute  "
sentence.[1]("cat", "dog")
sentence.[2]
sentence.[3]

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

Agsub!

Bupcase!

Crstrip!

Dgsub

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-bang methods which return new strings but do not modify the original.

Mixing up gsub and gsub!.

gsub! replaces text in place. Then upcase! changes all letters to uppercase in place. Finally, rstrip! removes trailing spaces in place.