Test 2

Question 1

A(n) ______ is a type of object used for storing multiple values in a single variable.

a. array
b. data structure
c. multi-layer variable
d. all of the above

Answer 1

a. array

Question 2

2. Arrays may contain data of any data type. T F

Answer 2

True

Question 3

Arrays may contain strings, Boolean values, functions and objects but they
cannot contain other arrays. T F

Answer 3

False

Question 4

The syntax for creating an array and assigning it to a variable value is:

a. var myArray = Array;
b. var myArray = new Array;
c. var myArray = Array( );
d. var myArray = new Array( );

Answer 4

d. var myArray = new Array( );

Question 5

The shorthand syntax for creating an array and assigning it to a variable value is:
a.  var myArray = ( ) ;  

b. var myArray = new ( );
c. var myArray = new [ ];
d. var myArray = [ ];

Answer 5

d. var myArray = [ ];

Question 6

Arrays can be assigned values at the time they are created or they can be added
after the array has been created. T F

Answer 6

True

Question 7

Arrays contain indexes that begin with zero. T F

Answer 7

True

Question 8

All arrays have a ______ property that tells how many items the array contains.
a. count

b. length
c. size
d. maxIndex

Answer 8

b. length

Question 9

The total number of items in an array is always one higher than the highest
index number. T F

Answer 9

True

Question 10

To add or delete specific items from an array, the best method to use is ______.
a. concat( )

b. join( )
c. splice( )
d. slice( )

Answer 10

c. splice( )

Question 11

Which of the following is NOT true when applying the spread operator:

a. it allows you to combine two arrays by positioning one array at a specific point in the other

b. it can be applied as a placeholder for additional data to be added at a
later time

c. it can be used to divide an array into a list of arguments to pass to a function
d. it can be used to collect and allocate values into an array

Answer 11

b. it can be applied as a placeholder for additional data to be added at a
later time

Question 12

Both the forEach( ) and the map( ) methods can be used to iterate through arrays. T F

Answer 12

True

Question 13

The difference between the forEach( ) and the map( ) methods is that forEach( ) can return a value whereas the map( ) cannot. T F

Answer 13

False

Question 14

Which statement is true when using the sort( ) method on an array:

a. sorting reassigns the sorted data into a new index based on its sorted value
b. sorting only works as long as each index contains the same data type
c. numbers are sorted alphabetically – meaning by the first digit
d. all of the above are correct

Answer 14

c. numbers are sorted alphabetically – meaning by the first digit

Question 15

It is usually more efficient and easier to maintain your code if you assign your event handlers inline rather than assigning them directly to the object properties. T F

Answer 15

False

Question 16

Mouse events, keyboard events, DOM object events and form events are the most common types of web page events but there are others too. T F

Answer 16

True

Question 17

Not all event handles can work with (be applied to) every HTML tag. T F

Answer 17

True

Question 18

Which of the following would NOT be appropriate to apply to a web page button:

a. onkeydown
b. onfocus
c. ondblclick
d. onload

Answer 18

d. onload

Question 19

Which of the following is NOT true when using the addEventListener( ):

a. it requires two parameters: first, the name of the function being called; and second, the type of event being assigned
b. should be used when you wish to apply more than one event to an object
c. it can listen on any DOM node you specify (not just page elements)
d. it can be used to add multiple events to the same object so that they will both execute when the event is triggered

Answer 19

a. it requires two parameters: first, the name of the function being called; and second, the type of event being assigned

Question 20

Which function would remove an event listener that has been previously applied:

a. deleteEventListener( )
b. cancelEventListener( )
c. removeEventListener( )
d. scrubEventListener( )

Answer 20

c. removeEventListener( )

Question 21

During bubbling, nested elements fire events:
a. at the same time

b. from the innermost to the outermost
c. from the outermost to the innermost
d. based on the type of node they are assigned to

Answer 21

b. from the innermost to the outermost

Question 22

To turn on capture mode instead of bubbling, what is the third parameter that needs to be added to the addEventListener( ) function?

a. capture
b. cancel
c. true
d. false

Answer 22

c. true

Question 23

Which of the following is NOT true about the event object:
a. all objects in the DOM are based on it

b. it can be used to obtain more detailed information about an event that has been detected
c. the event object is automatically passed to event handlers when called
d. in referring to an event in your code, it must be named either “event” or designated by the letter “ e “ only

Answer 23

d. in referring to an event in your code, it must be named either “event” or designated by the letter “ e “ only

Question 24

To prevent an event from doing what it would normally do, the _____________ method can be used.

a. perventDefault( )
b. cancelDefault( )
c. preventEvent( )
d. cancelEvent( )

Answer 24

a. perventDefault( )

Question 25

Which of the following is not a JavaScript operator? a. = b. == c. && d. =!

Answer 25

d. =!

Question 26

The general form of an “ if “ statement is: a. if (this condition is true) then do this b. if (this condition is false) then do this c. if (this condition is zero) then do this d. both A and B are correct, depending on the condition used

Answer 26

a. if (this condition is true) then do this

Question 27

What does an assignment operator do? a. assigns a new value to a variable b. gives a variable a new name c. performs a comparison d. all of the above, depending on how it is used

Answer 27

a. assigns a new value to a variable

Question 28

What does a comparison operator do? a. compares only strings; it does not work on numbers or calculations b. compares two values or statements, and returns a numerical value c. compares two values or statements, and returns a value of true or false d. compares only numbers; it does not work on strings

Answer 28

c. compares two values or statements, and returns a value of true or false

Question 29

Which of the following comparisons will return true? a. 4 != 3 b. 4 == 3 c. 4 < 3 d. 4 <= 3

Answer 29

a. 4 != 3

Question 30

Which of the following comparisons will return false? a. 4 != 3 b. 3 == 3 c. 4 > 3 d. 4 <= 3

Answer 30

d. 4 <= 3

Question 31

The ________ operators allow you to compare two conditional statements to see if one or both of the statements are true and to proceed accordingly. a. conditional b. assignment c. logical d. evaluation

Answer 31

c.logical

Question 32

Which of the following statements will return true? a. (3 == 3) && (5 < 1) b. !(17 >= 20) c. (3 != 3) || (7 < 2) d. (1 == 1) && (2 < 0)

Answer 32

b. !(17 >= 20)

Question 33

Which of the following statements will return false? a. !(3 <= 1) b. (4 >= 4) && (5 <= 2) c. (“a” == “a”) && (“c” != “d”) d. (2 < 3) || (3 < 2)

Answer 33

b.(4 >= 4) && (5 <= 2)

Question 34

Which of the following will compare both value and type: a. = b. = = c. = = = d. both B and C are correct

Answer 34

c. = = =

Question 35

If we want code to execute if a condition is not true, we use the ____ construct. a. if…else b. if…then c. do…while d. switch

Answer 35

a. if…else

Question 36

Which of the following is likely to cause an infinite loop to occur: a. the loop counter is never incremented/decremented inside the loop b. the loop contains too many conditional statements to be evaluated c. the loop does not contain a break statement to be executed when a pre- arranged condition is met d. yo’ mamma helped you write the code for your loop

Answer 36

a. the loop counter is never incremented/decremented inside the loop

Question 37

All switch statements must include a default option. T F

Answer 37

False

Question 38

All case statements inside a switch must include a break statement. T F

Answer 38

True

Question 39

The ________ loop is very similar to the if statement syntax except that after executing the code (as long as the condition evaluates true), it goes back and tests the condition again and again until it becomes false. a. while b. for c. do…while d. both A and C are correct

Answer 39

a. while

Question 40

The statements in a ______ loop will always execute at least once even if the conditional statement is never met. a. while b. for c. do…while d. both A and C are correct

Answer 40

c. do…while

Question 41

With the ______ loop, we can specify an initial condition, a test condition (to end the loop), and a means of changing the counter variable for each pass through the loop all in one statement. a. while b. for c. do…while d. for…in

Answer 41

b. for

Question 42

The _______ loop is a special type of loop that is used exclusively for stepping through the properties of an object so a loop counter or creating a conditional test to end the loop is not necessary. a. for…in b. for c. while…in d. do while…in

Answer 42

a. for…in

Question 43

To set up a specific delay in the execution of your JavaScript code, you can deploy either of which two methods that will function as a timer for your code? a. timeout( ) ; interval( ) b. SetTimeout( ) ; SetInterval( ) c. Timeout( ) ; Interval( ) d. setTimeout( ) ; setInterval( )

Answer 43

d. setTimeout( ) ; setInterval( )

Question 44

The break command works within a loop pretty much the same as it does in a switch statement – it kicks you out of the loop and returns operation to the line of code immediately after the closing curly brace. T F

Answer 44

True

Question 45

Procedural programming is characterized by having data stored in variables. T F

Answer 45

True

Question 46

A(n) ______ of an object is a particular application of an object “template” to create a working object based on specific data. a. copy b. class c. prototype d. instance

Answer 46

d. instance

Question 47

Which of the following is NOT an advantage of utilizing object-oriented programming: a. your code can be re-used in a variety of scripts. b. you can define the way objects interact with other parts of your scripts by controlling the methods and properties the rest of the program can “see”. c. new objects can be created based on the designs of previously-created objects. d. you can create your own HTML and CSS code definitions that can be used only in your web pages for unique functionality and appearance.

Answer 47

d. you can create your own HTML and CSS code definitions that can be used only in your web pages for unique functionality and appearance.

Question 48

Creating new objects by using the design of currently-existing objects is called: a. encapsulation b. inheritance c. instantiation d. prototyping

Answer 48

b. inheritance

Question 49

Which of the following is a valid method for creating a direct instance of an object: a. myObject = new Object( ); b. myObject.create( ); c. myObject = new Object; d. myObject.new( );

Answer 49

a. myObject = new Object( );

Question 50

New JavaScript objects are automatically created with a default set of properties or methods. T F

Answer 50

False

Question 51

Which of the following correctly creates a new function and then assigns that newly-created method to your new object called firstObject: a."" function firstFunct( ) { alert (“Hello World!”); } firstObject.displayGreeting = firstFunct( )"" b."" function firstFunct( ) { alert (“Hello World!”); firstObject.displayGreeting = firstFunct }"" c. ""function firstFunct( ) { alert (“Hello World!”); } firstObject.displayGreeting = firstFunct"" d."" function firstFunct( ) { alert (“Hello World!”); } firstObject.firstFunct = displayGreeting ""

Answer 51

C. ""function firstFunct( ) { alert (“Hello World!”); } firstObject.displayGreeting = firstFunct""

Question 52

Which of the following will allow you to call the object’s method that you assigned in question #7: a. firstObject.displayGreeting; b. firstObject.displayGreeting( ); c. firstObject = displayGreeting( ); d. firstObject = displayGreeting;

Answer 52

b. firstObject.displayGreeting( );

Question 53

After directly creating an instance of a new object, if you need to create another instance of that same object, you must go through the same process again – creating the object, adding the properties, etc. T F

Answer 53

True

Question 54

When you create a new object that will require the creation of multiple instances of that object, it is best to create a “template” of that object by using a(n) ___________________. a. object template function b. compound instances assignment c. object constructor function d. direct object assignment

Answer 54

c. object constructor function

Question 55

Creating an object instance is known as _______________ an object. a. templating b. compounding c. instantiating d. constructing

Answer 55

c. instantiating

Question 56

JavaScript provides a means to modify objects to include new methods and/or properties and also to create all new objects based on ones that already exist. T F

Answer 56

True

Question 57

The _____________ object allows you to add a property or method that then becomes available for all instances of the object. a. pattern b. architype c. compound d. prototype

Answer 57

d. prototype

Question 58

_____________ is the capability to hide data and instructions inside an object. a. Encapsulation b. Assimilation c. Consolidation d. Integration

Answer 58

a. Encapsulation

Question 59

Any variables or functions that are declared within the constructor function are available from either inside or outside of the object. T F

Answer 59

False

Question 60

A __________ acts as a template or blueprint for the creation of objects. a. function b. class c. event d. all of the above can be used depending upon the application

Answer 60

b. class

Question 61

A __________ function creates and initializes an object instance of a class. a. inheritance b. prototype c. event d. constructor

Answer 61

d. constructor

Question 62

A class constructor cannot be called without using the new keyword. T F

Answer 62

True

Question 63

4. Which statement is NOT true when using set: a. it only requires one argument ( newName ) b. it updates the value of a variable c. it can only be applied once in your code d. called when the property value is actually being assigned ( set )

Answer 63

c. it can only be applied once in your code

Question 64

Which statement is NOT true when using get: a. it does not require an argument b. it is used to retrieve a property value c. it is only available when also using the set function d. does not evaluate a property’s value until it is accessed

Answer 64

c. it is only available when also using the set function

Question 65

A(n) __________ is a unique data type used that is useful for naming object properties that cannot later be overwritten. a. symbol b. class c. prototype d. instance

Answer 65

a. symbol

Question 66

A symbol data type is basically similar to a string and so the same functionality applies to both. T F

Answer 66

False

Question 67

The _______ keyword is used in the constructor and acts as a reference variable to the parent class and is used to inherit all of its properties. a. set b. get c. extends d. super

Answer 67

d. super

Question 68

The _______ keyword is used to create a class as a child of another class. a. set b. get c. extends d. super

Answer 68

c. extends

Question 69

Another way to utilize browser detection is to have JavaScript examine whether or not a specific feature you need is supported by testing for the availability of a specific object, method or property through the browser’s version. T F

Answer 69

True

Question 70

The top-level object in the DOM is the ___________ object. a. document b. window c. browser d. screen

Answer 70

b. window

Question 71

An advantage of using the DOM is that the DOM is always available – even if the page has not yet completely finished loading. T F

Answer 71

False

Question 72

According to the DOM, everything in a web document is a(n) _______ -- which means the entire document, every element, every attribute and even it’s included text can all be classified as one of these. a. characteristic b. architype c. compound d. node

Answer 72

d. node

Question 73

Each different type of node has an associated number known as its _______ _________ property. a. nodeType b. nodeModel c. nodeID d. nodeDesignation

Answer 73

a. nodeType

Question 74

Which of the following statements is NOT true about the childNodes property: a. It is useful for each node in a collection. b. The results are returned as an indexed array. c. You can use all string and array methods on the returned results. d. It allows you to access information about the immediate children of any DOM node.

Answer 74

c. You can use all string and array methods on the returned results.

Question 75

After running the childNodes property, you can use the shorthand method ____________ to access the first element in the results; and you can use the shorthand method _____________ to access the last. a. firstParent ; lastParent b. firstElement ; lastElement c. firstChild ; lastChild d. firstNode ; lastNode

Answer 75

c. firstChild ; lastChild

Question 76

The childNodes property returns the parent node of the node to which it is applied. T F

Answer 76

False

Question 77

________ and ________ are methods that can be applied to a specific parent node in order to return the return the following and previous sibling nodes. a. nextSibling ; previousSibling b. nextChild ; previousChild c. followingSibling ; priorSibling d. followingChild ; priorChild

Answer 77

a. nextSibling ; previousSibling

Question 78

The __________ property returns the value stored in a node. a. nodeContent b. nodeValue c. getNodeContent d. getNodeValue

Answer 78

b. nodeValue

Question 79

The nodeName property returns the name of the specified node as a _______ value and is ________________________. a. array ; read-only and cannot be changed at all b. string ; read-only and cannot be changed at all c. array ; changeable using the standard array methods d. string ; changeable using the standard string methods

Answer 79

b. string ; read-only and cannot be changed at all

Question 80

The ________________ method allows you to build an array populated with all of the occurrences of a particular tag. a. getTagsByElementName( ) b. getTagByElementName( ) c. getElementsByTagName( ) d. getElementByTagName( )

Answer 80

c. getElementsByTagName( )

Question 81

In referencing the method referred to in question #29, you do not have to always apply it to the entire document; it can be applied to any individual object and will return a collection of elements with the given tag name contained within that object. T F

Answer 81

True

Question 82

Attributes are child nodes of the element node in which they appear. T F

Answer 82

True

Question 83

The _____________ method lets you read the attribute value of any node that you have accessed. a. getTagAttributes( ) b. getAttributes( ) c. getTagAttribute( ) d. getAttribute( )

Answer 83

d. getAttribute( )

Question 84

You can test whether or not an element has a particular attribute value defined, and if it does not, it will return a value of null. T F

Answer 84

True

Question 85

To create a new "p" element, you would use the following code: a. document.createElement(“p”); b. document.makeElement(“p”); c. document.createElement(p); d. document.makeElement(p);

Answer 85

a. document.createElement(“p”);

Question 86

To add text content to a web page element, you would use the _______ method. a. createTextNode( ) b. makeTextNode( ) c. addTextNode( ) d. appendTextNode( )

Answer 86

a. createTextNode( )

Question 87

If you already have a node in your document that is just like the one you want to create, you can use the ____________ method to do so. a. nodeClone( ) b. nodeCopy( ) c. cloneNode( ) d. copyNode( )

Answer 87

c. cloneNode( )

Question 88

If you want to make an exact copy of a node already in your document, including all of its child nodes, you would call the correct method and pass it the value T F

Answer 88

False

Question 89

If you wish to add a new node to an existing node already in your document, an easy way is to use the ___________ method to append it to that node. a. addChild( ) b. appendChild( ) c. attachChild( ) d. joinChild( )

Answer 89

b. appendChild( )

Question 90

The method that is referred to in question 38 always adds the new node before the first child node that is already present – therefore, the new node becomes the first child node of the parent node. T F

Answer 90

False

Question 91

When working with document nodes, which of the following methods is NOT a real method that can be used: a. insertAfter( ) b. replaceChild( ) c. insertBefore( ) d. removeChild( )

Answer 91

a. insertAfter( )

Question 92

To set the id attribute of a

tag to “part1”, which code would you use: a. setAttribute( “id”, “part1” ) b. setAttribute( id, part1 ) c. setAttribute( “part1”, “id” ) d. setAttribute( part1, id )

Answer 92

a. setAttribute( “id”, “part1” )

Question 93

Setting the value of an existing attribute effectively overwrites the value of that attribute. T F

Answer 93

True

Question 94

JSON ( JavaScript Object Notation ) is an open-standard format that uses human-readable text to transmit data objects consisting of attribute–value pairs. T F

Answer 94

true

Question 95

Once expressed in JSON, JavaScript objects can easily be converted to strings and then interpreted as JavaScript code. T F

Answer 95

True

Question 96

In JSON, when expressing your data as a sequence of parameters and value pairs, the ______ character is used to separate parameter from value. a. | ( pipe ) b. = ( equal ) c. ; ( semicolon ) d. : ( colon )

Answer 96

d. : ( colon )

Question 97

In JSON, when listing several sequences of parameters and value pairs, the ______ character is used to separate one pair from another. a. | ( pipe ) b. , ( comma ) c. ; ( semicolon ) d. : ( colon )

Answer 97

b. , ( comma )

Question 98

When creating a JSON object, the data pairs are enclosed in ____ as a group. a. “ “ ( single or double quotes ) b. [ ] ( square braces ) c. { } ( curly braces ) d. ( ) parenthesis

Answer 98

c. { } ( curly braces )

Question 99

Not only objects, but any data that can be expressed as a series of parameter and value pairs can be expressed in JSON notation. T F

Answer 99

True

Question 100

The term deserializing the string refers to: a. the process of converting a JSON data string back into JavaScript code b. the process of converting a string of JavaScript code into the JSON data format c. the process of debugging JSON data before adding it to JavaScript code d. the process of converting JSON data structures into the XML data format

Answer 100

a. the process of converting a JSON data string back into JavaScript code

Question 101

The _____ function can be used to convert a JSON string in a JavaScript object. a. eval( ) b. convert( ) c. changeData( ) d. modify( )

Answer 101

a. eval( )

Question 102

All browsers include native JSON support; this means that, by default, they create a JavaScript object called JSON to manage JSON decoding and encoding. T F

Answer 102

False

Question 103

The ____________ method takes a string containing a JSON-serialized object and breaks it up, creating an object with properties corresponding to the string’s parameter and value pairs. a. modify.JSON( ) b. parse.JSON( ) c. JSON.parse( ) d. JSON.modify( )

Answer 103

c. JSON.parse( )

Question 104

___________ is the process of converting data into a format that can be stored or transmitted across a network and recovered later into the same format as the original. a. Modification b. Serialization c. Parsing d. Initialization

Answer 104

b. Serialization

Question 105

. The JSON.stringify() method converts a JavaScript value to a JSON string. T F

Answer 105

True

Question 106

Which of the following statements is NOT one of the rules that must be followed when creating / naming the parameter part of the parameter and value pair: a. It cannot be a JavaScript reserved keyword. b. It must not start with a number. c. It must not include any special characters except the underscore or dollar sign. d. It cannot consist of less than 3 or more than 16 characters.

Answer 106

d. It cannot consist of less than 3 or more than 16 characters.

Question 107

As is the case with other programming languages, JavaScript fully supports the usage of associative arrays. T F

Answer 107

False

Question 108

The code syntax: object[“property”] and object.property are equivalent in JavaScript. T F

Answer 108

True

Question 109

Although it was developed for describing JavaScript objects, JSON is independent of any language or platform; libraries and tools exist for other programming languages such as C, PHP and Java. T F

Answer 109

True

Question 110

_____________ is the code that you would use in JSON to create an “empty” instance of an object which contains no properties or methods. a. var firstObject = [ ]; b. var firstObject = { }; c. var firstObject = ( ); d. var firstObject = “ “;

Answer 110

b. var firstObject = { };

Question 111

It is safer to use a browser with a native JSON parser to convert a JSON string into a JavaScript object; this is because a JSON parser will recognize only JSON text and will not execute script commands. T F

Answer 111

True