Deck 5: Working With Loops

Question 1

Ruby provides a number of different loop methods belonging to different classes. These methods simplify loop construction and help to eliminate the chance of errors that can happen when working with language looping constructs.

Answer 1

True

Question 2

Loops can be used to collect and process an unlimited amount of user input.

Answer 2

True

Question 3

Loop modifiers are perfect for situations where you need to repeat the execution of multiple statements.

Answer 3

False

Question 4

One limitation of loops is that they are not well suited to the development of scripts that need to be replayed over and over again.

Question 5

Loops help reduce the size of scripts making them easier to develop and maintain.

Question 6

The while modifier evaluates a Boolean expression and then conditionally executes the statement to which is has been appended as long as that condition remains true.

Question 7

When combined with conditional logic, loops provide the basis for developing the programming logic needed to process and validate user input.

Question 8

Loops provide you with the ability to repeat a set of statements over and over again as many times as necessary to perform a particular task.

Question 9

Loop modifiers are expressions appended to the end of Ruby statements, which are then repeatedly executed until a specified condition is met.

Question 10

An array is an indexed collection of items stored as a list.

Question 11

A feature unique to the for…in loop is that it is built to automatically repeat once for every element stored in an array.

Question 12

The until modifier repeatedly executes the statement to which it has been appended for as long as a specified condition remains true.

Question 13

Loop methods are language commands that are part of the set of built-in Ruby language constructions.

Question 14

The while loop is a loop that executes as long as a tested condition continues to evaluate as false.

Question 15

Language constructs are a category of loop that is associated with specific objects.

Question 16

The loop method is designed to be executed a given number of times.

Question 17

Using a minimum amount of code, loops facilitate the development of scripts that can process huge amounts of data. However, the cost of this processing efficiency comes at a price in terms of additional code statements.

Question 18

When working with the while or until loops, the do or : are mutually exclusive and can be omitted if the loop is spread out over more than one line.

Question 19

The while loop is specifically designed to facilitate the process of arrays

Question 20

A loop modifier is an expression added to the end of another Ruby statement that causes the execution of that statement as a loop.

Question 21

The each method is a very commonly used looping method. This method is supported by a number of different Ruby classes, including all of the following except ____.

A) The Array class
B) The Dir class
C) The String class
D) The Range class

Question 22

The retry method facilitates which of the following actions?

A) Terminates the execution of a loop
B) Repeats the current loop execution without evaluating the condition or iterating
C) Stops the current iteration of the loop and immediately begins a new iteration
D) Restarts the loop from the beginning, resetting the value of the iterator

Question 23

The times method is used to execute ____.

A) A code block a specific number of times
B) An individual code statement once for each item stored in an array
C) A code block for as long as a specified condition evaluates as true
D) None of the above

Question 24

The redo method facilitates which of the following actions?

A) Terminates the execution of a loop.
B) Repeats the current loop execution without evaluating the condition or iterating.
C) Stops the current iteration of the loop and immediately begins a new iteration.
D) Restarts the loop from the beginning, resetting the value of the iterator.

Question 25

The downto method iterates a predetermined number of times, starting at a specified integer value and counting down to whatever integer value is passed to it.

Question 26

The each method automatically iterates once for each item stored in the array.

Question 27

The for...in loop is designed to process collections of data, including:

A) Arrays
B) Ranges
C) Both A and B
D) Neither A or B

Question 28

The until loop is the opposite of the while loop. Instead of looping while a tested expression remains true, the until loop executes until ____.

A) The tested condition becomes true
B) The tested condition becomes false
C) The end of an array is reached
D) None of the above

Question 29

The step method is used to set up loops that execute a predefined number of times.

Question 30

Which of the following is true regarding the while or until loops?

A) It is the programmer's responsibility to specify a variable that will be used to control how many times the loop iterates.
B) It is the programmer's responsibility to determine how many times the loop repeats.
C) It is the programmer's responsibility to supply an expression for tracking the last element processed in the array and to increment its value at the end of each execution of the loop.
D) All of the above

Question 31

Ruby's built-in language looping constructions include which of the following?

A) while
B) until
C) for
D) All of the above

Question 32

Loops allow for the development of programming logic that can perform all of the following except ____.

A) Be repeatedly executed
B) Use a minimum number of controlling statements to control the execution of embedded statements
C) Analyze input and determine its validity
D) All of the above

Question 33

Ruby range operator ( .. ) provides the ability to do which of the following?

A) Generate a random number within a specified range
B) Display a range of consecutive letters or numbers
C) Iterate over a specified range of values
D) None of the above

Question 34

A loop is a collection of statements that ____.

A) Facilitate the processing of large text files
B) Facilitate the collection of unlimited amounts of user input
C) Provide the ability to develop scripts that can repeat the execution of any number of commands.
D) All of the above

Question 35

The next method facilitates which of the following actions?

A) Terminates the execution of a loop.
B) Repeats the current loop execution without evaluating the condition or iterating
C) Stops the current iteration of the loop and immediately begins a new iteration.
D) Restarts the loop from the beginning, resetting the value of the iterator.

Question 36

Ruby provides you with access to many different types of loops, which can be organized broadly as ____.

A) Language constructs
B) Modifiers
C) Methods
D) All of the above

Question 37

Which of the following is not a loop modifier supported by Ruby?

A) while
B) each
C) until
D) None of the above

Question 38

An iterator is a variable used to process the contents of a list of items.

Question 39

The upto method is provided by the String class.

Question 40

A(n) ____ loop is a loop that is set up so it never stops executing, unnecessarily using computer resources.

A) Iterative
B) Executive
C) Endless
D) Closed

Question 41

Which of the following loops supports two distinct forms of syntax?

A) while
B) until
C) loop
D) None of the above

Question 42

Ruby provides programmers with a number of different ways of altering a loop's execution, including all of the following methods except ____.

A) break
B) redo
C) redo
D) retry

Question 43

The ____ method stops the current iteration of the loop and immediately begins a new iteration. However, before the new iteration occurs, the loop condition is evaluated.

A) next
B) after
C) before
D) None of the above

Question 44

The break method facilitates which of the following actions?

A) Terminates the execution of a loop.
B) Repeats the current loop execution without evaluating the condition or iterating.
C) Stops the current iteration of the loop and immediately begins a new iteration.
D) Restarts the loop from the beginning, resetting the value of the iterator.

Question 45

The ____ method forces a loop to repeat only after evaluating its condition and without iterating.

A) next
B) after
C) before
D) None of the above

Question 46

Ruby supports different categories of loops, including which of the following?

A) Language constructs
B) Modifiers
C) Methods
D) All of the above

Question 47

Loops created using the ____ method run forever unless you provide a way to terminate them.

A) while
B) downto
C) loop
D) None of the above

Question 48

The break command provides the ability to ____.

A) Terminate the execution of a loop at any time.
B) Temporarily pause script execution
C) Place a script in debug mode
D) None of the above

Question 49

The loop method belongs to the ____.

A) Kernel class
B) Integer class
C) Array class
D) None of the above

Question 50

The step method works with which of the following classes?

A) The Float and Integer classes.
B) The String and Kernal classes.
C) The Array and Dir classes
D) The Range class