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How do you properly declare and read a class variable in Ruby within a class?

easy📝 Syntax Q3 of 15
Ruby - Class Methods and Variables
How do you properly declare and read a class variable in Ruby within a class?
AUse <code>@variable</code> inside instance methods
BUse <code>@@variable</code> to declare and access it inside class methods
CUse <code>$variable</code> to declare a global variable
DUse <code>variable</code> without any prefix inside instance methods
Step-by-Step Solution
Solution:
  1. Step 1: Understand class variable syntax

    Class variables in Ruby are prefixed with @@ and shared across the class and its subclasses.
  2. Step 2: Accessing class variables

    They are typically accessed inside class methods or instance methods using @@variable.
  3. Final Answer:

    Use @@variable inside class methods -> Option B
  4. Quick Check:

    Class variables require @@ prefix [OK]
Quick Trick: Class variables always start with @@ [OK]
Common Mistakes:
  • Confusing class variables with instance variables (@)
  • Using global variables ($) instead of class variables
  • Accessing class variables without the @@ prefix

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