Method_added hook in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a method that prints a message when a new method is added.

Ruby

class MyClass
  def self.method_added([1])
    puts "New method added: #{method_name}"
  end

  def greet
    puts 'Hello!'
  end
end

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

Aname

Bmethod

Cmethod_name

Dmethod_added

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong parameter name that doesn't represent the method's name.

Forgetting to define the parameter in the method signature.

The method_added hook receives the name of the newly added method as a symbol. Naming the parameter method_name is clear and conventional.

2fill in blank

medium

Complete the code to print the name of each method added to the class.

Ruby

class Tracker
  def self.method_added([1])
    puts "Method added: #{method_name}"
  end

  def example_method
  end
end

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

Aadded_method

Bmethod

Cname

Dmethod_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name that doesn't match the variable used inside the method.

Not defining any parameter, causing an error.

The parameter method_name correctly receives the symbol of the method just added, which is then printed.

3fill in blank

hard

Fix the error in the method_added hook to correctly print the added method's name.

Ruby

class Fixer
  def self.method_added([1])
    puts "Added method: #{method_name}"
  end

  def test
  end
end

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Amethod

Bmethod_name

Cname

Dadded

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between parameter name and variable used inside the method.

Omitting the parameter entirely.

The parameter method_name matches the variable used inside the method, fixing the error.

4fill in blank

hard

Fill both blanks to create a method_added hook that ignores methods starting with an underscore.

Ruby

class IgnoreUnderscore
  def self.method_added([1])
    return if method_name.to_s.start_with?([2])
    puts "Added: #{method_name}"
  end

  def _hidden
  end

  def visible
  end
end

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Amethod_name

B'_'

C'__'

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong parameter name.

Checking for the wrong prefix string.

The parameter method_name receives the method's name. Checking if it starts with '_' allows ignoring such methods.

5fill in blank

hard

Fill all three blanks to create a method_added hook that tracks added methods in a class variable array.

Ruby

class Tracker
  @methods = []

  def self.method_added([1])
    @methods [2] [3]
  end

  def first
  end

  def second
  end
end

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

Amethod_name

B<<

D+=

Attempts:

3 left

💡 Hint

Common Mistakes

Using += which creates a new array instead of modifying the existing one.

Using wrong parameter names.

The hook receives the method name as method_name. Using << adds it to the @methods array.