String concatenation and << in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to concatenate two strings using the + operator.

Ruby

greeting = "Hello, " [1] "world!"

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

A*

B<<

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using << instead of + will modify the original string instead of creating a new one.

Using * or - operators will cause errors or unexpected results.

The + operator joins two strings together to make one string.

2fill in blank

medium

Complete the code to append a string to another string using the << operator.

Ruby

name = "Ruby"
name [1] " is fun!"

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

A<<

B+

C*

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using + creates a new string instead of modifying the original.

Using * or - will cause errors or unexpected results.

The << operator appends the right string to the left string, modifying it in place.

3fill in blank

hard

Fix the error in the code to correctly concatenate strings using <<.

Ruby

message = "Hi"
message [1]= " there!"

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

A+

B<<

C+=

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using += works but creates a new string instead of modifying the original.

Using - causes syntax errors.

The << operator can be used with = to append and modify the original string.

4fill in blank

hard

Complete the code to create a hash where keys are words and values are their lengths using string concatenation.

Ruby

words = ["cat", "dog", "bird"]
lengths = {word: for word in words if word[1] 3}

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

A:

B>

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of > will select only words exactly 3 letters long.

Using < will select shorter words, not longer.

The colon : separates keys and values in a hash. The > operator filters words longer than 3 letters.

5fill in blank

hard

Fill all three blanks to build a hash with uppercase keys and values greater than 3.

Ruby

words = ["apple", "bat", "carrot"]
result = {word[1] word.length for word in words if word.length [2] 3 and word[3] "a"}

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

A.upcase

B>

C.include?

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > will select shorter words.

Using == instead of .include? will cause errors.

.upcase converts the word to uppercase for the key. > filters words longer than 3. .include? checks if the word contains 'a'.