Method naming conventions (? and ! suffixes) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a method that checks if a number is even using the correct naming convention.

Ruby

def even[1](number)
  number % 2 == 0
end

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

A_test

B!

C_check

D?

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!' instead of '?' for a method that returns a boolean.

Adding arbitrary suffixes like '_check' or '_test' which are not Ruby conventions.

In Ruby, methods that return a boolean value often end with a question mark (?).

2fill in blank

medium

Complete the code to define a method that modifies a string in place, following Ruby naming conventions.

Ruby

def capitalize[1](str)
  str.capitalize!
end

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

A!

B?

C_inplace

D_modify

Attempts:

3 left

💡 Hint

Common Mistakes

Using '?' instead of '!' for methods that modify objects.

Adding suffixes like '_inplace' which are not standard Ruby conventions.

In Ruby, methods that modify the object they are called on usually end with an exclamation mark (!).

3fill in blank

hard

Fix the error in the method name to follow Ruby conventions for a method that returns a boolean.

Ruby

def valid_email[1](email)
  email.include?('@')
end

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

A!

B_check

C?

D_valid

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!' for boolean methods.

Using arbitrary suffixes like '_check' or '_valid'.

Boolean methods in Ruby should end with a question mark (?).

4fill in blank

hard

Complete the code to define a method that modifies an array in place and returns a boolean indicating success.

Ruby

def add_element[1](array, element)
  array << element
  true
end

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A!

B?

D_modify

Attempts:

3 left

💡 Hint

Common Mistakes

Adding '?' after the parameter list which is invalid syntax.

Not using '!' for methods that modify objects.

Methods that modify objects end with '!' and the '?' is not used here because the method returns true explicitly.

5fill in blank

hard

Fill both blanks to define a method that checks if a string is empty and modifies it if not, following Ruby conventions.

Ruby

def process_string[1](str)
  if str.empty[2]
    false
  else
    str.upcase!
    true
  end
end

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

A?

B!

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!' instead of '?' for boolean methods.

Adding suffixes after the parameter list which is invalid.

The method name ends with '?', no suffix after parameters, and 'empty?' is a Ruby method that ends with '?'.