Enumerators and Iterators in Ruby MCQ question and answer with solution

1

What is an iterator in Ruby?

A) A predefined set of instructions for performing a specific task B) A data structure that stores elements sequentially C) A method that iterates over elements in a collection D) A method that repeatedly calls a block of code

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Answer & Solution

Answer: Option C

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2

Which method is used to create an enumerator in Ruby?

A) Enumerable.create B) Enumerator.create C) Enumerable.new D) Enumerator.new

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Answer & Solution

Answer: Option D

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3

What is the purpose of the each method in Ruby iterators?

A) To iterate over each element in a collection B) To filter elements in a collection C) To map elements to a new collection D) To sort elements in a collection

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Answer & Solution

Answer: Option A

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4

What does the map method do in Ruby enumerators?

A) Sorts elements in a collection B) Removes duplicate elements from a collection C) Selects elements from a collection based on a condition D) Applies a block of code to each element and returns a new collection

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Answer & Solution

Answer: Option D

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5

How do you define a custom iterator in Ruby?

A) By using the define_iterator keyword B) By extending the Iterator class C) By creating a method that yields to a block of code D) By invoking the create_iterator method

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Answer & Solution

Answer: Option C

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6

What does the select method do in Ruby enumerators?

A) Sorts elements in a collection B) Filters elements in a collection based on a condition 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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7

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

A) To sort elements in a collection B) To map elements to a new collection C) To combine all elements in a collection into a single value D) To filter elements in a collection

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Answer & Solution

Answer: Option C

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8

What is an enumerator in Ruby?

A) A data structure for storing elements sequentially B) A method that repeatedly calls a block of code C) A predefined set of instructions for performing a specific task D) An object that can be used to iterate over a collection

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Answer & Solution

Answer: Option D

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9

Which method is used to convert a collection into an enumerator in Ruby?

A) to_enum B) enum_for C) to_enumerator D) enumerator

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Answer & Solution

Answer: Option A

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10

What does the zip method do in Ruby enumerators?

A) Removes duplicate elements from a collection B) Applies a block of code to each element and returns a new collection C) Reverses the order of elements in a collection D) Combines elements from multiple collections into arrays

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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