UpWork (oDesk) & Elance Action Script 3.0 Test Question & Answers

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Ques : Which of the following methods of the XML object class can be used to add a new node to an XML object?
Ans  : appendNode()
       appendChild()
       prependChild()
 
Ques : When a variable is of the type protected, it is accessible in:
Ans  : all child classes irrespective of the package

Ques : Which of the following statements is correct?
Ans  :  The '.' and '@' operator can be used both to read and write data

Ques : What will be the output of the following code snippet?
    var myArray1 : Array = new Array ("One", "Two", "Three");
    for(var i : int=0; i<3 i="" p="">    {
        delete myArray1[i];
    }
    trace(myArray1.length);
Ans  : 0

Ques : Which of the following statement is not correct?
Ans  : While accessing child nodes of an XMLList, the array access operator '[]' can be used and the starting Index is 0.

Ques : What will be the output of the following code snippet?

    var myArray1 : Array = new Array("One", "Two", "Three");
    var myArray2 : Array = myArray1;
    myArray2[1] = "Four";
    trace(myArray1);
Ans  : One,Four,Three

Ques : Which of the following property of the String class returns the no. of characters in a string?
Ans  : length

Ques : Which of the following statements is true?
Ans  : An array is a collection of objects irrespective of the data types.

Ques : What would happen when the following piece of code is compiled and run?
var p : * = new ArrayCollection()      //Line1
p.addItem("vishal");                     //Line2
p.addItem(24);                        //Line3
p= new Date();                        //Line4
var mydate : Date = p;                  //Line5
Ans  : Compilation error at line4

Ques : Which of these is not a valid access modifier?
Ans  : All of the above are valid.

Ques : When ActionScript can immediately judge an operation to be in violation of a security rule, the __________ exception is thrown, and if, after waiting for some asynchronous task to complete, ActionScript deems an operation in violation of a security rule, the __________ event is dispatched.
Ans  : SecurityError, SecurityErrorEvent.SECURITY_ERROR

Ques : Which of the following is not a phase in the event propagation lifecycle?
Ans  : Cancelling

Ques : What will be the output of the following code snippet?

try {
    try {
        trace("<< try >>");
        throw new ArgumentError ("throw this error");
    } catch(error : ArgumentError) {
        trace("<< catch >> " + error);
        trace("<< throw >>");
        throw error;
    } catch(error:Error) {
        trace ("<< Error >> " + error);
    }
} catch (error:ArgumentError) {
    trace ("<< catch >> " + error);
}
Ans  :  << try >> << catch >> ArgumentError: throw this error << throw >> << catch >> ArgumentError: throw this error

Ques : What will be the output of the following trace statement?

trace ("output: " + 10 > 20);
Ans  : false

Ques : In the date formatter's format string, which of the following pattern letter represents minutes?
Ans  : M

Ques : Which event is triggered when a timer completes its execution?
Ans  : TimerEvent.TIMER_COMPLETE

Ques : Given the following string variable declaration, where 3 is an int

var myString : String = "These are " + 3 + " lines"

The value stored in myString is:
Ans  : These are 3 lines

Ques : The trim() method of StringUtil Class is used:
Ans  :  to remove all white spaces from the beginning and the end of the string

Ques : Given the following code snippet, what will be the output when helloWorld() is run?

public function helloWorld() : void {
    trace("Line 1" );
    var num : Number=25;
    try{
        num=num/0;
        trace ("Value of num in try: "+num.toString());
    }catch (err : IOError) {
        trace("Value of num in catch: "+num.toString());
    }finally{
        num=0;
    }
    trace("Value of num: "+num.toString());
}
Ans  :  Line1 Value of num in catch: 25 Value of num: 0

Ques :  Which of the following are primitive datatypes in Action script 3.0:
Ans  :  String

Ques : What will be the output of the following code snippet?

        var num1 : String="Hello";
        var num2:String="Hello";
        if (num1===num2) {
                trace ("Equal");
        } else {
                trace ("Unequal");
        }
Ans  : Equal

Ques : Which property of the Event object contains information about the component which generated that event?
Ans  : target

Ques : What will the output of the following trace statement?

trace(myXML..employee.(lastName=="Zmed"));
Ans  : The first employee block is printed on the console.

Ques : Given that two event listeners are registered for a component CompA as:

CompA.addEventListener(MouseEvent.CLICK, func1);
CompA.addEventListener(MouseEvent.CLICK, func2);

What will happen when a click event is fired on CompA?
Ans  : Both func1 and func2 are called.

Ques : When in application, in what order do the following events take place (starting from the first)?
Ans  :  pre-Initialize, Initialize, Creation complete, Application complete

Ques : What does the addItem() method of the ArrayCollection class do?
Ans  :  It adds an item at the end of the collection.

Ques : Given the code snippet below, what will be the value of myFlag after the 2nd assignment:
var myFlag : Boolean=false;
myFlag=Boolean (new Date ( ) );
Ans  : True

Ques : Which of the following is not a valid Action script data type?
Ans  : long

Ques : The only difference between a timer and a loop is that timers are machine speed independent while loops are not.
Ans  : False

Ques : Look at the following function declarations and then choose the correct option.

i. public function myFunction():*;
ii. public function myFunction():void;
iii. public function myFunction():String;
Ans  : i, ii & iii are all valid

Ques : Given the following instantiation of a date type variable, choose the statement which is true.

var myDate : Date = new Date()
Ans  : The value of myDate is the current time stamp.

Ques : Which of the following Errors does not occur at runtime?
Ans  : Compile time error

Ques : The useWeakReference parameter in the addEventListener method is used to:
Ans  :  make the listener eligible for garbage collection

Ques : Given the following statements about the try/catch/finally block, choose the correct option.
Ans  : Finally is optional but try and catch are required.

Ques : Based on the above mentioned declaration of myXML, how can we access the id attribute of the 'employee' tag?
Ans  : myXML.managers.employee[1].@id

Ques : Which of the following methods of the String class does not accept a regular expression as its parameter?
Ans  : substring()

Ques : Given the following code snippet:

public function helloWorld(value:int) : String {
switch(value){
  case 1:
    return "One";
    break;
  case 2:
    return "Two";
    break;
  case 3:
    return "Three";
    break;
  default:
    return "No Match";
  }
}

What will be returned if we pass call the above function as helloWorld(2):
Ans  : Two

Ques : A constant (const) variable can be initiated only once.
Ans  : True

Ques : Which of the following classes is not used to interact with the client system environment?
Ans  : ApplicationDomain Class

Ques : The minimum version of flash player required to run Action script 3.0 is:
Ans  : 9.0

Ques : Which of the following syntax would be used to call a method name helloWorld(), (defined in the html Wrapper) from actionscript?
Ans  : ExternalApplication.call ("helloWorld");

Ques : Given the declaration 'a timer', which of the following statements is correct?

var myTimer:Timer = new Timer (500,5);
Ans  :  When the timer is started, the TimerEvent.TIMER event is dispatched 5 times with a difference of 0.5 seconds between 2 successive events.

Ques : Which of the following conditions must be true to facilitate the usage of seek() function of an Array Collection's Cursor?
Ans  : None of the above

Ques : The following regular expression : var pattern : RegExp = /\d+/; will match:
Ans  : one or more digits

Ques : What does XML stand for?
Ans  : Extensible Markup Language

Ques : A String is:
Ans  : a series of zero or more characters.

Ques : Given the following code snippet:
public class Student {
    public function Student () {
        trace("Student variable created");
    }
    public function hello () : String {
        return "Hello World";
    }
}
-------------------------------------------------------
public function helloWorld () : String {
    var student1 : Student;
    return student1.hello ();
}

What will the function helloWorld() return?
Ans  : Hello World

Ques :  Which of the following types of variables can be accessed without creating an instance of a class?
Ans  : Static

Ques : E4X in Action script is used to:
Ans  :  manipulate XML data.

Ques : What will be the output of the following trace statement?

trace(myXML..employee.*.@*);
Ans  : An XMLList that includes every attribute defined on the employee tag's descendants but not on the employee tag

Ques : The default values of String and int type variables are:
Ans  : null and 0 respectively.

Ques : Which of the following statements is not correct?
Ans  :  When a timer is instantiated, it starts automatically.

Ques : While accessing the clipboard through the system manager class, we can:
Ans  : read data from the clipboard.

Ques : Given two String variables str1="Hello" and str2="World", which of the following 2 ways can be used to concatenate the 2 strings and store the result in str1?
Ans  : str1.concat(str2);

Ques : Which of the following loop structures are used to access dynamic instance variables of an object?
Ans  : for-each-in

Ques : Which of the following properties of the Date class does not accepts 0 as a value?
Ans  : date

Ques : Which class is the parent class of all custom event classes?
Ans  : Event

Ques : Suppose we have two swf's named Parent.swf and Child.swf (in the same domain), where the Child.swf is loaded inside the Parent.swf as a module, can an Event listener be registered in the Parent.swf to detect mouse click events inside the Child.swf?
Ans  : Yes, for any event

Ques :  Read the following statements and then choose the correct option.
i. A class can extend another class
ii. A class can Implement an Interface
iii. An interface can extend a class
iv. An interface can extend another interface
Ans  : Only i, ii and iv are true

Ques : Which of the following statements about the System class is true?
Ans  : It can be used to retrieve current memory usage for flash player.

Ques : The Error class serves as the base class for all run-time errors thrown by Flash.
Ans  : True

Ques : Which of the following keywords is used to bring control out of a loop?
Ans  : break

Ques : The addEventListener() method of the EventDispatcher class is used to:
Ans  : add/register a new listener for an event

Ques : Which of the following is not a security-sandbox type?
Ans  :  Remote-with-networking

Ques : If no Access modifier is specified for a property in a class, then by default, the property is:
Ans  : Private

Ques : What is the length of the given array?

var myArray1 : Array = new Array ("One", "Two", "Three");
Ans  : 3

Ques : Suppose we have an arrayCollection whose cursor (myCursor) has been created using the arraycollection's getCursor() method. At runtime, when myCursor.afterLast returns true, what is the value of myCursor.current?
Ans  : Null

Ques : Given a number, num = 23, which of the following methods will be used to convert it to a String:
Ans  : num.toString();

Ques : Which of the following is not a valid quantifier metacharacter used in Regular expressions?
Ans  : -

Ques : The compiled output of an Action script file is:
Ans  : '.swf' file

Ques : Given the following code snippet, what will be the output when helloWorld( ) is run?

public function helloWorld() : void {
    trace("Code Start" );
    try{
        throw new Error ("Test_Error");
        trace("try");
    } catch(err : Error) {
        trace("catch");
        return;
    }finally{
        trace("finally");
    }
    trace("Code End");
}
Ans  : Code Start catch finally

Ques : Which of the following is a valid variable name?
Ans  : _123

Ques : An Swf in a local security sandbox:
Ans  : can access some but not all resources in the local security sandbox.

Ques : Which kind of an error is thrown when parsing error occurs in the action script?
Ans  : Syntax error

Ques : The source of an ArrayCollection is of the type:
Ans  : Array

Ques : Which of the following is not a correct way of adding an item to an Array myArr?
Ans  : myArr.addItem(item);

Ques : Which nature of ActionScript is depicted by the use of Events?
Ans  : Asynchronous

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