Reject for inverse filtering in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to reject numbers less than 5 from the array.

Ruby

numbers = [1, 4, 6, 8]
filtered = numbers.reject { |n| n [1] 5 }
puts filtered

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

A>

B<

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using > instead of < causes wrong filtering.

Using == removes only numbers equal to 5.

The reject method removes elements for which the block returns true. To reject numbers less than 5, use <.

2fill in blank

medium

Complete the code to reject words longer than 3 characters.

Ruby

words = ['cat', 'dog', 'elephant', 'bat']
short_words = words.reject { |word| word.length [1] 3 }
puts short_words

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

A<=

B<

C==

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > keeps the wrong words.

Using <= rejects words with length 3 or less.

We want to reject words with length greater than 3, so use >.

3fill in blank

hard

Fix the error in the code to reject even numbers.

Ruby

numbers = [2, 3, 4, 5]
odd_numbers = numbers.reject { |n| n [1] 2 == 0 }
puts odd_numbers

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

A-

B*

C%

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using / instead of % causes a syntax error.

Using * or - does not check evenness.

The modulo operator % gives the remainder. To check even numbers, use n % 2 == 0.

4fill in blank

hard

Fill both blanks to reject words starting with 'a' or 'e'.

Ruby

words = ['apple', 'banana', 'elephant', 'dog']
filtered = words.reject { |word| word.start_with?([1]) || word.start_with?([2]) }
puts filtered

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

A'a'

B'b'

C'e'

D'd'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong letters causes wrong filtering.

Not using quotes causes syntax errors.

To reject words starting with 'a' or 'e', use 'a' and 'e' in start_with?.

5fill in blank

hard

Fill all three blanks to reject numbers divisible by 3 or less than 4.

Ruby

numbers = [1, 2, 3, 4, 5, 6]
filtered = numbers.reject { |n| n [1] 3 [3] 0 || n [2] 4 }
puts filtered

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

A%

B<

C>

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong operators causes wrong filtering.

Mixing up comparison operators leads to errors.

Use % to check divisibility by 3, < to check less than 4, and == to compare to zero.