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Categories / Computer Science & IT / Ruby Programming / ruby - Part 29

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ruby - Part 29

Question 1 of 25 Hints left: 3

Q1

What does the lambda keyword return in Ruby?

A A Block object
B A Method object
C A Proc object
D A Lambda object

Q2

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

Q3

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

Q4

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

Q5

What does the block_given? method do in Ruby?

A Checks if a proc has been passed to the current method
B Checks if a lambda has been passed to the current method
C Checks if a method has been passed to the current block
D Checks if a block has been passed to the current method

Q6

What does the lambda? method do in Ruby?

A Checks if an object is a lambda
B Invokes a lambda
C Converts a block into a lambda
D Converts a proc into a lambda

Q7

What does the arity method return for a proc or lambda in Ruby?

A The number of optional arguments for the proc or lambda
B The total number of arguments for the proc or lambda
C The number of required arguments for the proc or lambda
D None of the above

Q8

Which of the following is true about the stability of variables within a block in Ruby?

A Variables defined outside the block can be modified within the block
B Variables defined inside the block can be modified outside the block
C Variables defined within the block cannot be modified inside the block
D Variables defined within the block cannot be modified outside the block

Q9

In Ruby, what is a closure?

A A function that accepts another function as an argument
B A function that returns another function
C A function that captures the state of its surrounding scope
D A function that is defined within another function

Q10

Which method is used to create an enumerator in Ruby?

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

Q11

Which method is used to check if a block has been passed to a Ruby method?

A block_exists?
B block_present?
C has_block?
D block_given?

Q12

In Ruby, what is the difference between a proc and a lambda?

A Procs perform strict argument checking, while lambdas do not
B Lambdas can accept a variable number of arguments, while procs cannot
C Lambdas perform strict argument checking, while procs do not
D Procs can accept a variable number of arguments, while lambdas cannot

Q13

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

A to_enum
B enum_for
C to_enumerator
D enumerator

Q14

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

Q15

What is the purpose of the call method in Ruby procs and lambdas?

A To return the value of the proc or lambda
B To execute the code contained within the proc or lambda
C Both A and B
D None of the above

Q16

What does the yield keyword do in Ruby?

A Executes the block passed to the method
B Returns the value of the block passed to the method
C Exits the method and returns to the caller
D None of the above

Q17

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

Q18

What happens if you try to yield to a block that does not exist in Ruby?

A An IOError is raised
B A SyntaxError is raised
C A NoMethodError is raised
D An ArgumentError is raised

Q19

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

Q20

In Ruby, what is the purpose of the -> (stabby lambda) syntax?

A To define a proc
B To define a method
C To define a block of code
D To define a lambda function

Q21

What is the purpose of using the next keyword within a block in Ruby?

A To skip the rest of the block and move to the next iteration
B To exit the block and return to the caller
C To execute the block with different parameters
D None of the above

Q22

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

Q23

Which keyword is used to define a block in Ruby?

A block
B do
C Block
D None of the above

Q24

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

Q25

Which method is used to convert a block into a proc in Ruby?

A Proc.new
B &
C None of the above
D .to_proc

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