Question 1

Typically, what's the first thing you should do you in a subclass constructor?

Accepted Answer

In a subclass constructor, the first thing you should do is call the superclass constructor using `super(arguments);` to ensure that the superclass is properly initialized before adding any subclass-specific initialization.

Question 2

Suppose that you have a class named Student with a method named payFees and that you have instantiated an object named student. Which of the following is a proper call to the payFees method?

Accepted Answer

The method payFees is defined in the class Student, and student is an instance of the class Student. Therefore, the correct way to call the method payFees is student.payFees().

Question 3

The Array object's concat method returns a new array that is formed by concatenating the argument array to the end of the calling object array.

Accepted Answer

The concat method in JavaScript creates a new array by merging the calling array with one or more arrays or values provided as arguments, without modifying the original arrays.

Question 4

An object has properties and methods. It is the properties that provide the interface with the outside world.

Accepted Answer

Methods, not properties, provide the interface with the outside world by allowing interaction and manipulation of an object's data. Properties store the object's state.

Question 5

OOP stands for ____________________.

Accepted Answer

The answer of OOP stands for ____________________....

Question 6

If the following code executes, what message displays in the resulting dialog box?
var x = 3.5;
alert(x > 3 ? x + 1 : x - 1);

Accepted Answer

The answer of If the following code executes, what message...

Question 7

Why might it be appropriate for a button's onclick event-handler function to call its event object's stopPropagation method?

Accepted Answer

The answer of Why might it be appropriate for a...

Question 8

Provide code that instantiates an array named carMakes such that the new array contains "Ford" and "Honda".

Accepted Answer

The answer of Provide code that instantiates an array named...

Question 9

Sort the following three strings so they are in ascending lexicographical order (words that are considered less than other words should be at the left).
"aardvark", "African polecat", "AARP"

Accepted Answer

The answer of Sort the following three strings so they...

Question 10

What is a two-dimensional array?

Accepted Answer

The answer of What is a two-dimensional array?...

Question 11

The formal term for creating an object is:

Accepted Answer

Instantiation is the process of creating an object from a class.

Question 12

What is the difference between a method heading and a function heading?

Accepted Answer

A function heading typically uses the word "function" to define it, whereas a method heading does not necessarily use the word "method" explicitly.

Question 13

If you declare a variable with var, but do not initialize it to a value, what will the variable contain?

Accepted Answer

When a variable is declared with `var` but not initialized, it is automatically assigned the value `undefined` in JavaScript.

Question 14

Suppose an onclick event-handler function includes an e parameter for its passed-in event object. What code could be used to access the mouse pointer's x coordinate position?

Accepted Answer

The `e.clientX` property of the event object provides the horizontal coordinate of the mouse pointer relative to the viewport when the event was triggered.

Question 15

Using the formal JavaScript inheritance terms, which of the following is true?

Accepted Answer

A subclass inherits from a superclass.

Question 16

A class property is associated with a class as a whole, not with an individual instance of a class.

Accepted Answer

A class property, often defined using the `@classmethod` decorator in Python, is shared across all instances of the class and is associated with the class itself rather than any particular instance.

Question 17

To call a regular method, you preface the method name with an object and a dot. The object is referred to as a cotterized object.

Accepted Answer

The object is not referred to as a "cotterized object"; it is simply called an object or an instance of a class.

Question 18

To emulate a class with legacy code, you implement a function whose name serves as a class name, and that function then serves as a constructor.

Accepted Answer

In some programming languages like JavaScript, functions can be used to emulate classes by acting as constructors, allowing the creation of objects with properties and methods.

Question 19

Polymorphism refers to a variable's ability to change its type from a string to a number.

Accepted Answer

Polymorphism in programming refers to the ability of different objects to be treated as instances of the same class through a common interface, not changing a variable's type.

Question 20

A(n) __________ is a special method that gets called when there is an attempt to create an object.

Accepted Answer

The answer of A(n) __________ is a special method that...

Quiz 11: Object-Oriented Programming and Arrays