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Categories / Computer Science & IT / Ruby Programming / ruby - Part 30

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ruby - Part 30

Question 1 of 25 Hints left: 3

Q1

What does the one? method do in Ruby enumerators?

A Checks if exactly one element satisfies a given condition
B Checks if all elements satisfy a given condition
C Checks if any element satisfies a given condition
D Checks if no elements satisfy a given condition

Q2

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

Q3

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

A Converts an enumerator into a hash
B Converts an enumerator into an array
C Delays the execution of operations on an enumerator until they are needed
D Executes operations on an enumerator immediately

Q4

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

A Sorts elements in a collection
B Applies a block of code to each element and returns a new collection
C Iterates over each element in a collection
D Iterates over each consecutive sequence of a given size in a collection

Q5

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

Q6

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

Q7

What does the grep_v method do in Ruby enumerators?

A Splits a collection into slices before elements that satisfy a given condition
B Iterates over each element in a collection indefinitely
C Combines elements from multiple collections into arrays
D Filters elements in a collection based on a regular expression, excluding matches

Q8

What does the each_slice method do in Ruby enumerators?

A Iterates over each consecutive sequence of a given size in a collection
B Splits a collection into slices before elements that satisfy a given condition
C Iterates over each element in a collection along with its index
D Checks if any element satisfies a given condition

Q9

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

Q10

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

Q11

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

Q12

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

Q13

What does the take_while method do in Ruby enumerators?

A Repeatedly applies a block of code to each element
B Checks if any element satisfies a given condition
C Takes elements from a collection until a given condition is met
D Iterates over each element in a collection and applies a block of code to accumulate a value

Q14

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

A Combines all elements in a collection into a single value
B Checks if any element satisfies a given condition
C Finds the first element that satisfies a given condition
D Repeats the execution of a block of code for each element in a collection

Q15

What are Ruby Gems?

A Ruby's built-in version control system for managing projects
B Ruby modules for organizing code
C Built-in data structures in Ruby
D Pre-packaged libraries or applications that provide additional functionality to Ruby applications

Q16

What does the slice_before method do in Ruby enumerators?

A Slices a collection based on a given condition
B Removes elements from a collection before a given condition
C Removes elements from a collection after a given condition
D Splits a collection into slices before elements that satisfy a given condition

Q17

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

A Repeatedly applies a block of code to each element
B Splits a collection into slices before elements that satisfy a given condition
C Iterates over each element in a collection indefinitely
D Checks if any element satisfies a given condition

Q18

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

Q19

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

A Splits a collection into slices before elements that satisfy a given condition
B Repeats the execution of a block of code for each element in a collection
C Checks if any element satisfies a given condition
D Iterates over each element in a collection along with its index

Q20

What does the max method do in Ruby enumerators?

A Returns the total number of elements that satisfy a given condition
B Returns the element with the maximum index
C Returns the element with the maximum value based on a given condition
D Returns the maximum value in a collection

Q21

Which method is used to check if all elements in a collection satisfy a condition in Ruby enumerators?

A any?
B all?
C one?
D None of the above

Q22

What does the flat_map method do in Ruby enumerators?

A Converts a collection into an enumerator
B Maps each element to a new collection and flattens the results
C Iterates over each element in a collection and applies a block of code to accumulate a value
D None of the above

Q23

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

Q24

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

A Splits a collection into chunks based on a given condition
B Combines elements from multiple collections into arrays
C Applies a block of code to each element and returns a new collection
D Iterates over each consecutive sequence of a given size in a collection

Q25

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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