IRB for interactive exploration in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start the interactive Ruby shell (IRB).

Ruby

system('[1]')

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

Airb

Bruby

Crails

Dgem

Attempts:

3 left

💡 Hint

Common Mistakes

Typing 'ruby' instead of 'irb' starts the Ruby interpreter but not the interactive shell.

Using 'rails' or 'gem' commands won't open IRB.

Typing irb in the terminal starts the interactive Ruby shell where you can try Ruby commands live.

2fill in blank

medium

Complete the code to assign the value 10 to variable x inside IRB.

Ruby

x [1] 10

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

A==

B!=

C=

D=>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' which is a comparison operator, not assignment.

Using '=>' which is used in hashes, not for assignment.

Use the single equals sign = to assign a value to a variable in Ruby.

3fill in blank

hard

Fix the error in the IRB command to print 'Hello World'.

Ruby

puts [1]Hello World[1]

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

A"

B'

C`

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using backticks which execute shell commands.

Using colon which is invalid syntax here.

In Ruby, double quotes " or single quotes ' can be used for strings. Here, double quotes are correct to enclose the string.

4fill in blank

hard

Fill both blanks to create a hash with key :name and value 'Alice' in IRB.

Ruby

person = [1] => [2]

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

A:name

B"Alice"

C'Alice'

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using plain word 'name' without colon for key.

Using double quotes for key which is less common for symbols.

In Ruby, symbols like :name are used as keys in hashes. Strings can be enclosed in single quotes like 'Alice'.

5fill in blank

hard

Fill all three blanks to create an array of numbers from 1 to 5 and print each number in IRB.

Ruby

numbers = ([1]..[2]).to_a
numbers.each do |[3]|
  puts [3]
end

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

A1

B5

Cnum

Di

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 or 6 instead of 1 or 5 for range boundaries.

Using 'i' as block variable when 'num' is expected here.

The range 1..5 creates numbers from 1 to 5. to_a converts it to an array. The block variable num is used to print each number.