Advanced Topics in Ruby MCQ question and answer with solution

31

What is the main difference between instance_eval and class_eval in Ruby?

A) instance_eval evaluates code within the context of a method, while class_eval evaluates code within the context of a block B) instance_eval evaluates code within the context of a block, while class_eval evaluates code within the context of a method C) instance_eval evaluates code within the context of an object, while class_eval evaluates code within the context of a class D) instance_eval evaluates code within the context of a class, while class_eval evaluates code within the context of an object

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Answer & Solution

Answer: Option C

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32

What is the purpose of the prepend method in Ruby?

A) Adds a method to the end of a class definition B) Adds a module to the inheritance chain after the class itself C) Adds a method to the beginning of a class definition D) Adds a module to the inheritance chain before the class itself

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Answer & Solution

Answer: Option D

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33

In Ruby, what does it mean to "freeze" an object?

A) Prevents further modifications to the object's state B) Locks the object's methods so they cannot be overridden C) Forces the object to release all resources allocated to it D) Prevents the object from being garbage collected

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Answer & Solution

Answer: Option A

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34

What is the purpose of the BasicObject class in Ruby?

A) It is a special class used for metaprogramming purposes B) It is a module that defines common utility methods for all Ruby objects C) It provides a set of basic methods that all Ruby objects inherit D) It serves as the root of the Ruby class hierarchy

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Answer & Solution

Answer: Option D

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35

Which method is commonly used to convert an object into its string representation in Ruby?

A) to_str B) stringify C) to_s D) convert_to_string

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Answer & Solution

Answer: Option C

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36

What is the purpose of the Object#tap method in Ruby?

A) It evaluates a block of code within the context of the object B) It allows you to perform operations on an object and return the object itself C) It raises an exception if the object is nil D) None of the above

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Answer & Solution

Answer: Option B

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37

What does the term "lazy evaluation" refer to in Ruby?

A) Repeatedly evaluating a computation until the desired result is obtained B) Storing the result of a computation for future use C) Delaying the execution of a computation until the result is needed D) Evaluating a computation as soon as it is defined

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Answer & Solution

Answer: Option C

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38

What is the purpose of the Enumerable#reduce method in Ruby?

A) It filters elements of a collection based on a given condition B) It transforms each element of a collection using a given block C) It sorts elements of a collection based on a given criteria D) It combines all elements of a collection into a single value using a binary operation

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Answer & Solution

Answer: Option D

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39

What is the significance of using the include? method in Ruby's Enumerable module?

A) It checks if a collection includes a specific element B) It includes a module into the current class C) It iterates over each element of a collection D) It creates a new collection by filtering elements based on a given condition

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Answer & Solution

Answer: Option A

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40

Which method is used to convert a hash into an array of key-value pairs in Ruby?

A) flatten B) values C) keys D) to_a

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Answer & Solution

Answer: Option D

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