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Categories / Computer Science & IT / Ruby Programming / ruby - Part 41

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ruby - Part 41

Question 1 of 11 Hints left: 3

Q1

What is a "class variable" in Ruby?

A A variable that is initialized with the value of a constant
B A variable that is shared among all instances of a class
C A variable that is dynamically assigned based on the instance's state
D None of the above

Q2

What is the purpose of the Kernel#autoload method in Ruby?

A It automatically loads a specified file when a constant is accessed for the first time
B It loads all files in a directory when the program starts
C It reloads a file every time it is accessed
D It loads a file asynchronously to improve performance

Q3

What does the "splat" operator (*) do when used in method definitions in Ruby?

A It allows a method to accept a variable number of arguments as an array
B It repeats a block of code a specified number of times
C It creates a shallow copy of an array or hash
D It performs a bitwise operation on a numerical value

Q4

What is the purpose of the method_missing method in Ruby's BasicObject class?

A It is called when a method is defined on a class object that already exists
B It is called when a method is called on a class object that does not exist
C It is called when a method is defined on an object that already exists
D It is called when a method is called on an object that does not respond to the method

Q5

What is the purpose of the retry keyword in Ruby?

A It resumes execution at the beginning of the block where an exception was rescued
B It re-runs the entire program from the beginning
C It raises an exception if an error occurs during method execution
D It restarts the current iteration of a loop

Q6

What does the super keyword do in Ruby?

A It calls the method of the same name in the current class
B It returns the superclass of the current class
C It calls the method of the same name in the superclass
D It returns the current class as a superclass

Q7

What is the purpose of the const_missing method in Ruby?

A It is called when a constant is accessed that is already defined
B It is called when a constant is accessed that is not defined
C It is called when a constant is defined that is not accessed
D None of the above

Q8

What is a "magic comment" in Ruby?

A A comment that is automatically removed during code compilation
B A comment that automatically generates documentation for the code
C A special comment that affects the behavior of the Ruby interpreter
D A comment with a mystical or cryptic meaning

Q9

In Ruby, what is the purpose of the Module#prepend method?

A It includes a module in the inheritance chain after the class itself
B It extends a module to add new functionality
C It creates a copy of the module and appends it to the end of the inheritance chain
D It includes a module in the inheritance chain before the class itself

Q10

What does the term "aliasing" refer to in Ruby?

A Creating a copy of an existing method or variable
B Renaming an existing method or variable
C Deleting an existing method or variable
D Creating an alternate name for an existing method or variable

Q11

What is the purpose of the Module#attr_reader, Module#attr_writer, and Module#attr_accessor methods in Ruby?

A They define getter, setter, and both getter and setter methods for instance variables respectively
B They define methods for reading, writing, and both reading and writing instance variables respectively
C They define methods for reading instance variables, writing class variables, and both respectively
D They define methods for reading, writing, and both reading and writing class variables respectively

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