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Given the following Ruby code, what will be the output?

hard📝 Application Q15 of 15
Ruby - Classes and Objects
Given the following Ruby code, what will be the output?
class Calculator
  def self.description
    "I am a Calculator"
  end

  def initialize(value)
    @value = value
  end

  def show_description
    self.class.description
  end
end

calc = Calculator.new(10)
puts calc.show_description
ANoMethodError
B"Calculator"
C"I am a Calculator"
D"10"
Step-by-Step Solution
Solution:
  1. Step 1: Understand self.class.description inside instance method

    Inside show_description, self is the instance calc. Calling class returns the class Calculator.
  2. Step 2: Call class method description

    Calling description on the class returns the string "I am a Calculator".
  3. Final Answer:

    "I am a Calculator" -> Option C
  4. Quick Check:

    Instance calls class method via self.class = output string [OK]
Quick Trick: Use self.class to call class methods from instances [OK]
Common Mistakes:
  • Expecting instance variable value instead of class method output
  • Confusing self with class inside instance methods
  • Thinking NoMethodError will occur

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