Array creation methods in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an empty array.

Ruby

arr = [1]

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

A[]

B{}

C()

Dnil

Attempts:

3 left

💡 Hint

Common Mistakes

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

In Ruby, square brackets [] create an empty array.

2fill in blank

medium

Complete the code to create an array with numbers 1 to 5 using a range.

Ruby

arr = (1..[1]).to_a

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A4

B6

C5

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using 4 excludes the number 5 from the array.

The range 1..5 includes numbers from 1 to 5. Calling to_a converts it to an array.

3fill in blank

hard

Fix the error in the code to create an array with 3 elements, all set to 0.

Ruby

arr = Array.new([1], 0)

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A-1

B0

C5

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 creates an empty array, not an array with elements.

Array.new(3, 0) creates an array with 3 elements, each set to 0.

4fill in blank

hard

Fill both blanks to create an array of 4 elements, each initialized to its index multiplied by 2.

Ruby

arr = Array.new([1]) { |[2]| [2] * 2 }

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

A4

Bi

Cindex

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 5 for size creates 5 elements, not 4.

Array.new(4) { |i| i * 2 } creates an array [0, 2, 4, 6].

5fill in blank

hard

Fill all three blanks to create an array of 3 elements, each a string 'item' followed by its index.

Ruby

arr = Array.new([1]) { |[2]| "[3]#{ [2] }" }

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

A3

Bi

Citem

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'index' as string instead of variable name causes errors.

This code creates ["item0", "item1", "item2"] by combining the string 'item' with the index.