[Solved] What is wrong with this hook usage?class Framework def self.before_save(&block) @before_save = block end def self.run_before_save @before_save.call end end Framework.run_before_save | Ruby

Ruby - Advanced Metaprogramming

What is wrong with this hook usage?

class Framework
  def self.before_save(&block)
    @before_save = block
  end

  def self.run_before_save
    @before_save.call
  end
end

Framework.run_before_save

ADefining before_save as a class method

BCalling @before_save.call without checking if block exists

CUsing instance variable instead of class variable

DMissing block parameter in before_save

Step-by-Step Solution

Solution:

Step 1: Check run_before_save method
It calls @before_save.call without verifying if @before_save is set.
Step 2: Identify potential error
Since no block was assigned before calling run_before_save, this causes a nil error.
Final Answer:
Calling @before_save.call without checking if block exists -> Option B
Quick Check:
Always check block presence before calling = B [OK]

Quick Trick: Check if block exists before calling it [OK]

Common Mistakes:

Calling nil block without check
Confusing instance vs class variables
Assuming class method definition is wrong

Master "Advanced Metaprogramming" in Ruby

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

More Ruby Quizzes

What is wrong with this hook usage?

Step 1: Check run_before_save method

Step 2: Identify potential error

Final Answer:

Quick Check:

Want More Practice?