Enumerators and Iterators in Ruby MCQ question and answer with solution

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How do you create a custom enumerator in Ruby?

A) By defining a method that yields to a block of code B) By invoking the create_enumerator method C) By extending the Enumerator class D) By using the define_enumerator keyword

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Answer & Solution

Answer: Option C

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What is the purpose of the each_with_index method in Ruby enumerators?

A) To map elements to a new collection B) To iterate over each element in a collection along with its index C) To sort elements in a collection D) None of the above

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Answer & Solution

Answer: Option B

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What does the cycle method do in Ruby enumerators?

A) Removes duplicate elements from a collection B) Sorts elements in a collection C) Iterates over each element in a collection indefinitely D) Repeatedly applies a block of code to each element

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Answer & Solution

Answer: Option C

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What does the find method do in Ruby enumerators?

A) Returns an array containing elements that satisfy a given condition B) Returns the last element that satisfies a given condition C) Returns the total number of elements that satisfy a given condition D) Returns the first element that satisfies a given condition

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Answer & Solution

Answer: Option D

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What is the purpose of the times method in Ruby enumerators?

A) Executes a block of code a specified number of times B) Iterates over each element in a collection C) Converts a collection into an enumerator D) Sorts elements in a collection

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Answer & Solution

Answer: Option A

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What does the 'any?' method do in Ruby enumerators?

A) Checks if the enumerator is empty B) Checks if no elements satisfy a given condition C) Checks if all elements satisfy a given condition D) Checks if any element satisfies a given condition

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Answer & Solution

Answer: Option D

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What does the inject method do in Ruby enumerators?

A) Sorts elements in a collection B) Converts a collection into an array C) Combines all elements in a collection into a single value D) Iterates over each element in a collection and applies a block of code to accumulate a value

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Answer & Solution

Answer: Option C

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What does the grep method do in Ruby enumerators?

A) Sorts elements in a collection B) Filters elements in a collection based on a regular expression C) Removes duplicate elements from a collection D) None of the above

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Answer & Solution

Answer: Option B

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What is the purpose of the drop_while method in Ruby enumerators?

A) Applies a block of code to each element and returns a new collection B) Sorts elements in a collection C) Skips elements in a collection until a given condition is met D) Removes elements from a collection until a given condition is met

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Answer & Solution

Answer: Option C

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What does the max_by method do in Ruby enumerators?

A) Returns the maximum value in a collection B) Returns the element with the maximum index C) Returns the element with the maximum length D) Returns the element with the maximum value based on a given condition

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Answer & Solution

Answer: Option D

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Enumerators and Iterators in Ruby MCQ question and answer with solution | Ruby Programming MCQs