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Which of the following correctly defines a class method named greet using self in Ruby?

easy📝 Syntax Q3 of 15
Ruby - Classes and Objects
Which of the following correctly defines a class method named greet using self in Ruby?
Adef greet(self); 'Hello'; end
Bdef greet.self; 'Hello'; end
Cdef self.greet; 'Hello'; end
Ddef class.greet; 'Hello'; end
Step-by-Step Solution
Solution:

  1. Step 1: Syntax for class methods

    Class methods are defined by prefixing the method name with self. inside the class.

  2. Step 2: Analyze options

    def self.greet; 'Hello'; end uses def self.greet which is the correct syntax. Options B, C, and D are invalid Ruby syntax for class methods.

  3. Final Answer:

    def self.greet; 'Hello'; end -> Option C

  4. Quick Check:

    Class methods use def self.method_name [OK]
Quick Trick: Class methods start with def self.method_name [OK]
Common Mistakes:
  • Using invalid syntax like def greet.self
  • Trying to pass self as a parameter
  • Using def class.method which is not valid

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