Why operators are methods in Ruby - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add two numbers using the plus operator method.

Ruby

result = 5.[1](3)

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

A/

B-

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' or '*' instead of '+' will give wrong results.

Forgetting that operators are methods and need parentheses.

In Ruby, the plus operator + is actually a method. So 5 + 3 is the same as 5.+(3).

2fill in blank

medium

Complete the code to check equality using the '==' operator method.

Ruby

is_equal = 'ruby'.[1]('ruby')

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

A==

B>

C<

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' reverses the logic.

Using '<' or '>' compares order, not equality.

The equality operator == is a method that compares two objects in Ruby.

3fill in blank

hard

Fix the error in the code by replacing the blank with the correct operator method to multiply.

Ruby

product = 4.[1](5)

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

A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' or '-' will add or subtract instead of multiply.

Using '/' divides instead of multiplying.

The multiplication operator * is a method in Ruby used to multiply numbers.

4fill in blank

hard

Fill both blanks to create a hash that maps numbers to their squares using operator methods.

Ruby

squares = {1[1]1, 2[2]4}

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

A=>

B:

C,

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using ':' instead of '=>' is valid only for symbol keys, not numbers.

Using ',' or '-' between key and value causes syntax errors.

In Ruby, the hash rocket => is used to map keys to values in a hash.

5fill in blank

hard

Fill all three blanks to define a method that adds two numbers using operator methods.

Ruby

def add(a, b)
  a[1]b
end

sum = add([2], [3])

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

A+

B5

C3

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' instead of '+' changes addition to subtraction.

Passing arguments in wrong order or missing them causes errors.

The method uses the '+' operator method to add a and b. We call add(5, 3) to get the sum.