Spaceship operator (<=>) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to compare two numbers using the spaceship operator.

Ruby

result = 5 [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 the spaceship operator.

Using > or < which only return boolean values.

The spaceship operator <=> compares two values and returns -1, 0, or 1.

2fill in blank

medium

Complete the code to compare two strings alphabetically using the spaceship operator.

Ruby

result = 'apple' [1] 'banana'

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

A<

B==

C>=

D<=>

Attempts:

3 left

💡 Hint

Common Mistakes

Using == which only checks equality.

Using < which returns boolean, not -1, 0, or 1.

The spaceship operator compares strings lexicographically and returns -1, 0, or 1.

3fill in blank

hard

Fix the error in the code by replacing the incorrect operator with the spaceship operator.

Ruby

result = 10 [1] 10

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

A==

B<=>

C=

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using == which returns boolean true or false.

Using = which is assignment, not comparison.

The spaceship operator <=> correctly compares two values and returns 0 when they are equal.

4fill in blank

hard

Fill both blanks to create a hash that maps numbers to their comparison results with 7 using the spaceship operator.

Ruby

comparisons = Hash[[5, 7, 9].map { |num| [num, num [1] 7] if num [2] 7 }.compact]

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

A<=>

B==

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of <=> in the hash values.

Using == or <=> in the filter condition incorrectly.

The first blank uses the spaceship operator to compare num with 7. The second blank filters numbers greater than 7.

5fill in blank

hard

Fill all three blanks to create a hash that maps words to their length comparison with 4 using the spaceship operator and a condition.

Ruby

result = Hash[['cat', 'house', 'dog'].map { |word| [word, word.length [1] 4] if word.length [2] 4 and word [3] 'dog' }.compact]

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

A<=>

B>

C!=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of <=> for length comparison.

Using == instead of != to exclude 'dog'.

The first blank uses the spaceship operator to compare lengths. The second blank filters words longer than 4. The third blank excludes the word 'dog'.