Deck 7: Using Object Oriented Javascript

Question 1

The code for a method must be stored in an external function.

Answer 1

False

Question 2

The ____ class contains methods and properties for manipulating the date and time.

A) Zone
B) Calendar
C) Date
D) Time

Answer 2

C

Question 3

When working with a date, JavaScript stores the month as a ____.

A) value from 0-11
B) value from 1-12
C) two-letter abbreviation
D)three-letter abbreviation

Answer 3

A

Question 4

____ refers to cleaning up, or reclaiming, memory that is reserved by a program.

A) Information hiding
B) Garbage collection
C) Data collection
D) Object hiding

Question 5

A(n)____ function is a function that is used as the basis for a custom object.

A) constructor
B) object
C) instance
D) class

Question 6

The code (methods and statements)and data (variables and constants)contained in an encapsulated object are accessed through a(n)____.

A) black box
B) view
C) interface
D) template

Question 7

The ____ class contains methods for manipulating numbers and properties that contain static values representing some of the numeric limitations in the JavaScript language.

A) Integer
B) Number
C) Math
D) Limits

Question 8

To delete a specific property in a custom object, you use the ____ operator.

A) remove
B) cancel
C) erase
D) delete

Question 9

The value of an object property can be another object.

Question 10

The code  new Date() creates an empty Date object.

Question 11

To execute the same statement or command block for all the properties within a custom object, you can use the ____ statement.

A) for/each
B) while/in
C) for/in
D) loop/in

Question 12

You can use the Math  object directly in your programs without instantiating a new object.

Question 13

The term ____ refers to information contained within variables or other types of storage structures.

A) data
B) object
C) class
D) instance

Question 14

A(n)____ is an object that has been created from an existing class.

A) instance
B) interface
C) template
D) black box

Question 15

You can create a function that will be used as an object method by referring to any object properties it contains with the ____ reference.

A) self
B) this
C) super
D) object

Question 16

The ____ class contains methods and properties for performing mathematical calculations in your programs.

A) Number
B) Integer
C) Function
D) Math

Question 17

A(n)____ array is an array whose elements are referred to with an alphanumeric key instead of an index number.

A) parallel
B) class
C) associative
D) bidimensional

Question 18

Objects are also called ____.

A) data
B) functions
C) methods
D) components

Question 19

The ____ property is a built-in property that specifies the constructor from which an object was instantiated.

A) experiment
B) try
C) prototype
D) test

Question 20

You can create an empty object by assigning a pair of empty braces to a variable  name.

Question 21

Which Number class method can you use to convert a number to a string that is formatted with local numeric formatting style?

A)toFixed()
B)toLocaleString()
C)toPrecision()
D)toString()

Question 22

You can create an empty object by assigning a pair of empty __________ to a variable name.

Question 24

Which class requires you to use a constructor?

A) Math
B) Number
C) Date
D) Array

Question 25

How can you get the full text of the day of the week based on information retrieved from a Date object?

Question 26

Describe two ways of adding properties to an object.

Question 27

What is a sub-object? Provide an example.

Question 28

When creating an object using a literal, you separate multiple property-value pairs with ____.

A)colons
B)spaces
C)semicolons
D)commas

Question 29

You can append the name of any Number class method or property to the name of an existing variable that contains a(n)____________________ value.

Question 30

How do you declare a property within an object literal?

Question 31

Which method of the Math object rounds a value to the next lowest integer?

A)ceil()
B)floor()
C)max()
D)min()

Question 32

What are some of the benefits of encapsulation?

Question 33

Explain the difference between the Number and Math classes.

Question 34

Why is JavaScript said to be an object-based programming language?

Question 35

What is garbage collection and how is it performed in JavaScript apps?

Question 36

To add a property to a constructor function, you must add a statement to the function body that uses the ____ keyword.

A)NaN
B)function
C)this
D)property

Question 37

The principle of ____________________ states that any methods and properties that other programmers do not need to access or know about should be hidden.

Question 38

A particular instance of an object ____________________ its methods and properties from a class-that is, it takes on the characteristics of the class on which it is based.

Question 39

____________________ refers to the creation of reusable software objects that can be easily incorporated into multiple programs.

Question 40

If you assign the current date and time to a variable, what is the value of that variable one hour later? Explain.

Question 41

Describe two ways of adding a method to an object.