Question 1

Which of the following methods is used to determine whether a property is enumerable?

Accepted Answer

A)  prop.propertyIsEnumerable(obj) 
B)  obj.propertyIsEnumerable(prop) 
C)  obj.Enumerable(prop) 
D)  propertyIsEnumerable(prop) 
A)  prop.propertyIsEnumerable(obj) 
B)  obj.propertyIsEnumerable(prop) 
C)  obj.Enumerable(prop) 
D)  propertyIsEnumerable(prop)

Question 2

You should start at the top and move down to the lower subclasses to define the _____.

Accepted Answer

A)  base object 
B)  object literal 
C)  prototype chain 
D)  object constructor 
A)  base object 
B)  object literal 
C)  prototype chain 
D)  object constructor

Question 3

A prototype chain is created by defining an object prototype as a constructor function.

Accepted Answer

A) True 
 B)False

Question 4

Case-Based Critical Thinking Questions Case 13-3 Thomas wants to create a custom object using the new operator. He applies the following commands: var objName = new Object(); object.property = value; object.method = function() { commands }; What limitation can Thomas face while creating a custom object using the new operator?

Accepted Answer

A)  He cannot use nested functions. 
B)  He cannot use prototype chains. 
C)  He cannot reuse the object. 
D)  He cannot use a for…in loop. 
A)  He cannot use nested functions. 
B)  He cannot use prototype chains. 
C)  He cannot reuse the object. 
D)  He cannot use a for…in loop.

Question 5

The _____ method is similar to the apply() method except that the argument values are placed in a comma-separated list of values instead of an array.

Accepted Answer

A)  shuffle() 
B)  sort() 
C)  call() 
D)  create() 
A)  shuffle() 
B)  sort() 
C)  call() 
D)  create()

Question 6

The constructor for Object supports methods that are used to retrieve and define properties for any object.

Accepted Answer

A) True 
 B)False

Question 7

You can determine whether an object has the property, prop , using the hasOwnProperty(prop) method.

Accepted Answer

A) True 
 B)False

Question 8

for…in loops do not follow a specific order because they accept properties that can be listed and read out in any order. If order is important, you can use a(n) _____.

Accepted Answer

A)  object literal 
B)  Array object 
C)  prototype chain 
D)  Object constructor 
A)  object literal 
B)  Array object 
C)  prototype chain 
D)  Object constructor

Question 9

Which of the following object methods returns a text string representation of object using local standards?

Accepted Answer

A)  obj.LocaleString() 
B)  object.toLocale() 
C)  object.toLocaleString() 
D)  obj.toLocaleString() 
A)  obj.LocaleString() 
B)  object.toLocale() 
C)  object.toLocaleString() 
D)  obj.toLocaleString()

Question 10

The showName() method provides another way to create objects that are based on existing prototypes.

Accepted Answer

A) True 
 B)False

Question 11

When an object is instantiated from a constructor function, it copies the properties and methods from the prototype into the new object.

Accepted Answer

A) True 
 B)False

Question 12

Case-Based Critical Thinking Questions Case 13-1 Kenneth wants to create a custom object for a specific programming task. He has defined the custom object by creating it as an object literal. Kenneth should store the properties of the object within a comma-separated list of _____ pairs enclosed within a set of curly braces.

Accepted Answer

A)  name:value 
B)  object:name 
C)  object:value 
D)  name:size 
A)  name:value 
B)  object:name 
C)  object:value 
D)  name:size

Question 13

Refer to the following code snippet and identify the use of the shift() method in the code provided. pokerCard.prototype.replaceFromDeck = function(pokerDeck) { this.suit = pokerDeck.cards[0].suit; this.rank = pokerDeck.cards[0].rank; this.rankValue = pokerDeck.cards[0].rankValue; pokerDeck.cards.shift(); }

Accepted Answer

A)  To remove the suit, rank, and rankValue from the pokerDeck object 
B)  To add the suit, rank, and rankValue to the pokerDeck object 
C)  To add the first card to the cards array in the pokerDeck object 
D)  To remove the first card from the cards array in the pokerDeck object. 
A)  To remove the suit, rank, and rankValue from the pokerDeck object 
B)  To add the suit, rank, and rankValue to the pokerDeck object 
C)  To add the first card to the cards array in the pokerDeck object 
D)  To remove the first card from the cards array in the pokerDeck object.

Question 14

Which of the following commands is used to add a method to a prototype .

Accepted Answer

A)  objName.prototype.function = method; 
B)  objName.prototype.method = function; 
C)  objClass.prototype.method = function; 
D)  objInstance.prototype.function = method; 
A)  objName.prototype.function = method; 
B)  objName.prototype.method = function; 
C)  objClass.prototype.method = function; 
D)  objInstance.prototype.function = method;

Question 15

JavaScript is an object-based programming language that involves working with the properties and methods associated with objects.

Accepted Answer

A) True 
 B)False

Question 16

A base object is the only object that has a prototype.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following methods is applied to sort any array in random order?

Accepted Answer

A)  sort() method 
B)  shuffle() method 
C)  object create() method 
D)  console.log() method 
A)  sort() method 
B)  shuffle() method 
C)  object create() method 
D)  console.log() method

Question 18

Identify the first step that is executed when JavaScript encounters code that references an object property or method.

Accepted Answer

A)  Check for the property or method with the object's prototype 
B)  Continue moving down the chain until the property or method is located or the end of the chain is reached 
C)  If the prototype is an instance of another object, check for the property or method in that object 
D)  Check for the property or method within the current object instance 
A)  Check for the property or method with the object's prototype 
B)  Continue moving down the chain until the property or method is located or the end of the chain is reached 
C)  If the prototype is an instance of another object, check for the property or method in that object 
D)  Check for the property or method within the current object instance

Question 19

for…in loops do not follow a specific order because properties can be listed and read out in any order.

Accepted Answer

A) True 
 B)False

Question 20

Identify the syntax of the call() method.

Accepted Answer

A)  function.call(arg1, arg2, arg3, ...) 
B)  function.call(thisObj, arg1, arg2, arg3, ...) 
C)  call.function(thisObj, arg1, arg2, arg3, ...) 
D)  function.call(Obj1, Obj2,...) 
A)  function.call(arg1, arg2, arg3, ...) 
B)  function.call(thisObj, arg1, arg2, arg3, ...) 
C)  call.function(thisObj, arg1, arg2, arg3, ...) 
D)  function.call(Obj1, Obj2,...)

Which of the following methods is used to determine whether a property is enumerable?

You should start at the top and move down to the lower subclasses to define the _____.

A prototype chain is created by defining an object prototype as a constructor function.

The _____ method is similar to the apply() method except that the argument values are placed in a comma-separated list of values instead of an array.

The constructor for Object supports methods that are used to retrieve and define properties for any object.

You can determine whether an object has the property, prop , using the hasOwnProperty(prop) method.

for…in loops do not follow a specific order because they accept properties that can be listed and read out in any order. If order is important, you can use a(n) _____.

Which of the following object methods returns a text string representation of object using local standards?

The showName() method provides another way to create objects that are based on existing prototypes.

When an object is instantiated from a constructor function, it copies the properties and methods from the prototype into the new object.

Which of the following commands is used to add a method to a prototype .

JavaScript is an object-based programming language that involves working with the properties and methods associated with objects.

A base object is the only object that has a prototype.

Which of the following methods is applied to sort any array in random order?

Identify the first step that is executed when JavaScript encounters code that references an object property or method.

for…in loops do not follow a specific order because properties can be listed and read out in any order.

Identify the syntax of the call() method.

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Exam 14: Exploring Object-Based Programming

Which of the following methods is used to determine whether a property is enumerable?

You should start at the top and move down to the lower subclasses to define the _____.

A prototype chain is created by defining an object prototype as a constructor function.

The _____ method is similar to the apply() method except that the argument values are placed in a comma-separated list of values instead of an array.

The constructor for Object supports methods that are used to retrieve and define properties for any object.

You can determine whether an object has the property, prop , using the hasOwnProperty(prop) method.

for…in loops do not follow a specific order because they accept properties that can be listed and read out in any order. If order is important, you can use a(n) _____.

Which of the following object methods returns a text string representation of object using local standards?

The showName() method provides another way to create objects that are based on existing prototypes.

When an object is instantiated from a constructor function, it copies the properties and methods from the prototype into the new object.

Which of the following commands is used to add a method to a prototype .

JavaScript is an object-based programming language that involves working with the properties and methods associated with objects.

A base object is the only object that has a prototype.

Which of the following methods is applied to sort any array in random order?

Identify the first step that is executed when JavaScript encounters code that references an object property or method.

for…in loops do not follow a specific order because properties can be listed and read out in any order.

Identify the syntax of the call() method.

Getting Started With Html5

Getting Started With Css Tutorial

Designing a Page Layout Tutorial

Graphic Design With Css Tutorial

Designing for the Mobile Web Tutorial

Working With Tables and Columns Tutorial

Designing a Web Form Tutorial

Enhancing a Website With Multimedia Tutorial

Getting Started With Javascript Tutorial

Exploring Arrays Loops and Conditional Statements Tutorial

Working With Events and Styles Tutorial

Working With Document Nodes and Style Sheets Tutorial

Programming for Web Forms Tutorial

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