Advanced Topics in Ruby MCQ question and answer with solution

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What is a "memoization" technique in Ruby?

A) Dynamically defining methods based on certain conditions B) Creating anonymous functions that can be called later C) Caching the return value of a method for future invocations D) Evaluating a block of code within the context of a specific object

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Answer & Solution

Answer: Option C

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Which method is commonly used to dynamically define instance methods in Ruby?

A) method_missing B) instance_method C) define_method D) create_method

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Answer & Solution

Answer: Option C

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In Ruby, what is the purpose of the #method method?

A) It invokes the specified method on the object B) It checks if the object responds to the specified method C) It defines a new method on the object D) It returns a Method object representing the specified method

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Answer & Solution

Answer: Option D

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What is the purpose of the public_send method in Ruby?

A) It invokes a public method on an object, bypassing visibility restrictions B) It sends a message to the Ruby interpreter to execute a piece of code C) It checks if the object responds to the specified method D) It returns a Method object representing the specified method

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Answer & Solution

Answer: Option A

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Which Ruby module is commonly used to implement the Singleton design pattern?

A) Kernel B) Module C) Factory D) Singleton

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Answer & Solution

Answer: Option D

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What does the term "DSL" stand for in Ruby programming?

A) Dynamic Static Language B) Distributed Systems Language C) Domain-Specific Language D) Data Serialization Language

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Answer & Solution

Answer: Option C

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What is the purpose of the attr_accessor method in Ruby?

A) It creates only a setter method for a class attribute B) It creates getter and setter methods for a class attribute C) It creates a private attribute for a class D) None of the above

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Answer & Solution

Answer: Option B

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What is a "callback" in the context of Ruby on Rails?

A) A method that is called when a database query is executed B) A method that is called when an exception occurs C) A method that is called in response to a specific event in the application lifecycle D) A method that is called before an object is instantiated

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Answer & Solution

Answer: Option C

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What does the "stabby lambda" (->) syntax in Ruby represent?

A) It is used to define instance methods B) It is used to define class methods C) It is used to define method aliases D) It is used to define anonymous functions

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Answer & Solution

Answer: Option D

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In Ruby, what is the purpose of the module_function keyword?

A) It ensures that the module cannot be included in other modules or classes B) It makes the specified methods accessible both as instance methods and module methods C) It converts the specified methods into private methods D) None of the above

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Answer & Solution

Answer: Option B

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Advanced Topics in Ruby MCQ question and answer with solution | Ruby Programming MCQs