Why everything is an object in Ruby - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a string object in Ruby.

Ruby

greeting = [1]

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

Astring("Hello")

BHello

C'Hello'.to_s

D"Hello"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the text.

Using a method that does not exist like string().

In Ruby, strings are objects created by enclosing text in quotes.

2fill in blank

medium

Complete the code to check the class of an object in Ruby.

Ruby

number = 10
puts number.[1]

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

Aclass

Bkind

Ctype

Dobject_type

Attempts:

3 left

💡 Hint

Common Mistakes

Using type which is not a Ruby method.

Using kind or object_type which do not exist.

The class method returns the class of an object in Ruby.

3fill in blank

hard

Fix the error in the code to call a method on an integer object.

Ruby

num = 5
puts num.[1]

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

Ato_s

Blength

Cupcase

Dsplit

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to use string methods on numbers.

Using methods that do not exist for integers.

Integers do not have a length, upcase, or split method. to_s converts the integer to a string.

4fill in blank

hard

Fill both blanks to create a hash with symbol keys and access a value.

Ruby

person = { [1]: "Alice", [2]: 30 }
age = person[:age]
puts age

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

Aname

Bage

C"name"

D"age"

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings as keys but accessing with symbols.

Putting quotes around keys when symbols are expected.

Symbols like :name and :age are used as keys in Ruby hashes. Accessing with person[:age] returns 30.

5fill in blank

hard

Fill all three blanks to create an array, add an element, and print its length.

Ruby

fruits = [1]
fruits.[2]("banana")
puts fruits.[3]

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

A[]

Bpush

Clength

Dappend

Attempts:

3 left

💡 Hint

Common Mistakes

Using append which is not a Ruby array method.

Using parentheses instead of square brackets for arrays.

An empty array is []. Use push to add an element. length returns the number of elements.