Object identity (equal? vs ==) in Ruby - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if two strings have the same content using the correct operator.

Ruby

str1 = "hello"
str2 = "hello"
puts str1 [1] str2

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

A==

Bequal?

C===

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using equal? instead of == to compare content.

In Ruby, == checks if two objects have the same content.

2fill in blank

medium

Complete the code to check if two variables point to the exact same object.

Ruby

a = "ruby"
b = a
puts a.[1](b)

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

A==

B===

Cequal?

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of equal? to check object identity.

The equal? method checks if two variables reference the same object in memory.

3fill in blank

hard

Fix the error in the code to correctly check if two arrays are the same object.

Ruby

arr1 = [1, 2, 3]
arr2 = [1, 2, 3]
puts arr1.[1](arr2)

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

A==

B===

C!=

Dequal?

Attempts:

3 left

💡 Hint

Common Mistakes

Using == which returns true for arrays with same content but different objects.

To check if two arrays are the exact same object, use equal?. Using == checks content equality.

4fill in blank

hard

Fill both blanks to create a hash that maps strings to their object identity check results.

Ruby

str1 = "test"
str2 = "test"
result = { str1: str1 [1] str2, str2: str1.[2](str2) }

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

A==

Bequal?

C===

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up == and equal? in the hash values.

The first blank uses == to check content equality, the second uses equal? to check object identity.

5fill in blank

hard

Fill all three blanks to create a method that returns true if two objects have the same content but are different objects.

Ruby

def same_content_different_object?(obj1, obj2)
  obj1 [1] obj2 && !obj1.[2](obj2) && obj1 [3] obj2
end

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

A==

Bequal?

Cis_a?

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using equal? instead of == for content comparison.

This method checks if obj1 and obj2 have the same content (==), are not the same object (!equal?), and are not unequal (!= used to confirm difference).