Keywords

Question 1

Break

Answer 1

Terminates the current loop, or if in conjunction with a label, terminates the associated statement.

Question 2

Case

Answer 2

Enables the execution of one or more statements when a specified expression’s value matches a label.

Question 3

Case syntax

Answer 3

switch (obj.constructor){
      case Date:
         return "Object is a Date.";
         break;
      case Number:
         return "Object is a Number.";
         break;
      case String:
         return "Object is a String.";
         break;
      default: 
         return "Object is unknown.";

Question 4

try…catch…finally Statement

Answer 4

Implements error handling for JScript.

Question 5

try…catch…finally syntax

Answer 5

try
{
    var arr = new Array(-1);
}
catch(e)
{
    print ("Error Message: " + e.message);
    print ("Error Code: " + (e.number & 0xFFFF))
    print ("Error Name: " + e.name);
}

Question 6

class

Answer 6

Declares the name of a class as well as a definition of the variables, properties, and methods that comprise the class.

Question 7

class syntax

Answer 7

class Person{ }

Question 8

Constant

Answer 8

Declares a constant.

Question 9

Constant syntax

Answer 9

const index = 5;

Question 10

Continue

Answer 10

Stops the current iteration of a loop, and starts a new iteration. For example, if you put in a for loop if the continue is hit it will exit for the loop.

Question 11

Debugger

Answer 11

Will launch the installed debugger. Acts like a break point.

Question 12

Delete

Answer 12

Deletes a property from an object, removes an element from an array, or removes an entry from an IDictionary object.

Question 13

do….while

Answer 13

Executes a statement block once, and then repeats execution of the loop until a condition expression evaluates to false

Question 14

do….while syntax

Answer 14

do
{
    s +=  i + " ";
    i++;
} while (i < 10);

Question 15

If…..else

Answer 15

Conditionally executes a group of statements, depending on the value of an expression.

Question 16

If….else

Answer 16

var z = 3;
if (x == 5)
    {
    if (y == 6)
        z = 17;
    }
else
    z = 20;

Question 17

export

Answer 17

The export statement is used when creating JavaScript modules to export functions, objects, or primitive values from the module so they can be used by other programs with the import statement.

Question 18

extends

Answer 18

Optional. Keyword indicating that the class classname extends baseclass. If this keyword is not used, a standard JScript base class is created that extends System.Object.

Question 19

false

Answer 19

A Boolean value that represents false.

Question 20

for

Answer 20

Executes a block of statements for as long as a specified condition is true.

Question 21

Function

Answer 21

Declares a new function. This can be used in several contexts:

Question 22

Syntax declare a function in global scope

Answer 22

function functionname([paramlist]) [: type] {
   [body]
}

Question 23

Syntax to declare a method in a class

Answer 23

[attributes] [modifiers] function functionname([paramlist]) [: type] {
[body]
}

Question 24

Syntax to declare a method in an interface

Answer 24

[attributes] [modifiers] function functionname([paramlist]) [: type]