Proc creation and call in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a Proc that returns 'Hello'.

Ruby

greet = Proc.new { [1] }

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

Areturn "Hello"

Bputs "Hello"

C"Hello"

Dprint "Hello"

Attempts:

3 left

💡 Hint

Common Mistakes

Using puts or print inside the Proc returns nil instead of the string.

Using return inside a Proc block causes an error.

The Proc should return the string "Hello". Using just the string "Hello" inside the block returns it.

2fill in blank

medium

Complete the code to call the Proc and print its result.

Ruby

greet = Proc.new { "Hello" }
puts [1]

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

Agreet.call()

Bgreet()

Cgreet.call

Dgreet

Attempts:

3 left

💡 Hint

Common Mistakes

Using just the Proc variable name prints the Proc object, not its result.

Using greet() without call is invalid syntax for Proc.

To call a Proc in Ruby, use call(). This executes the Proc and returns its value.

3fill in blank

hard

Fix the error in the code to correctly create and call a Proc that adds 5 to a number.

Ruby

add_five = Proc.new { |num| num [1] 5 }
result = add_five.call(10)
puts result

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

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication changes the intended result.

Using division causes unexpected results or errors.

The Proc should add 5 to the input number, so the plus operator + is correct.

4fill in blank

hard

Fill both blanks to create a Proc that checks if a number is even and call it with 8.

Ruby

is_even = Proc.new { |n| n [1] 2 == 0 }
puts is_even.[2](8)

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

A%

Bcall

C==

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using == inside the block incorrectly.

Trying to call the Proc without call method.

The modulo operator % checks the remainder when dividing by 2. The Proc is called using call.

5fill in blank

hard

Fill all three blanks to create a Proc that multiplies a number by 3, call it with 7, and print the result.

Ruby

triple = Proc.new { |x| x [1] 3 }
result = triple.[2]([3])
puts result

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

A*

Bcall

C7

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Forgetting to call the Proc with an argument.

Passing the argument incorrectly.

The Proc multiplies by 3 using *. It is called with 7 using call, and the result is printed.