Why arrays are fundamental in Ruby - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an empty array in Ruby.

Ruby

my_array = [1]

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

A{}

B[]

C()

D<>

Attempts:

3 left

💡 Hint

Common Mistakes

Using curly braces {} which create a hash, not an array.

Using parentheses () which are for method calls or grouping.

In Ruby, arrays are created using square brackets [].

2fill in blank

medium

Complete the code to add the number 5 to the end of the array.

Ruby

numbers = [1, 2, 3]
numbers.[1](5)
puts numbers.inspect

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

Apush

Bpop

Cshift

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop which removes the last element.

Using shift which removes the first element.

The push method adds an element to the end of an array.

3fill in blank

hard

Fix the error in the code to access the first element of the array.

Ruby

fruits = ['apple', 'banana', 'cherry']
first = fruits[1]
puts first

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A[0]

B(0)

C(1)

D{0}

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets.

Using curly braces which are for hashes.

Arrays in Ruby use square brackets with zero-based indexes to access elements.

4fill in blank

hard

Fill both blanks to create an array of squares for numbers 1 to 5.

Ruby

squares = (1..5).[1] { |n| n [2] n }
puts squares.inspect

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Amap

B*

C+

Dselect

Attempts:

3 left

💡 Hint

Common Mistakes

Using select which filters elements instead of transforming.

Using + which adds numbers instead of multiplying.

The map method transforms each number by multiplying it by itself.

5fill in blank

hard

Fill all three blanks to select even numbers and double them.

Ruby

result = (1..10).[1] { |x| x [2] 2 == 0 }.[3] { |x| x * 2 }
puts result.inspect

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

Amap

B%

Cselect

Dfilter

Attempts:

3 left

💡 Hint

Common Mistakes

Using filter which is not a Ruby array method.

Using + instead of % to check evenness.

First, select filters even numbers using the modulo operator %, then map doubles each selected number.