Explore topic-wise InterviewSolutions in .

Err.CLEAR clear an ERROR.

Example:

Err.Raise 6 ' Raise an OVERFLOW error.
MsgBox "Error # " & CStr(Err.Number) & " " & Err.Description
Err.Clear ' Clear the error.

Err.Clear clear an error.

Example:

Err.Raise 6 ' Raise an overflow error.
MsgBox "Error # " & CStr(Err.Number) & " " & Err.Description
Err.Clear ' Clear the error.

Err.NUMBER GIVES the ERROR number and Err.Description gives error description.

Example:

Err.Raise 6 ' Raise an overflow error.
MsgBox "Error # " & CStr(Err.Number) & " " & Err.Description

Err.Number gives the error number and Err.Description gives error description.

Example:

Err.Raise 6 ' Raise an overflow error.
MsgBox "Error # " & CStr(Err.Number) & " " & Err.Description

Use Err.RAISE to THROW an ERROR.

Example:

Err.Raise 6 ' Raise an OVERFLOW error.

Use Err.Raise to throw an error.

Example:

Err.Raise 6 ' Raise an overflow error.

If we WANT to capture the ERROR, then Err Object is used.

If we want to capture the error, then Err Object is used.

The Execute METHOD works LIKE REPLACE, except that it returns a Matches collection OBJECT, containing a Match object for each successful match. It doesn't modify the original string.

The Execute method works like Replace, except that it returns a Matches collection object, containing a Match object for each successful match. It doesn't modify the original string.

The REPLACE METHOD takes 2 parameters. If the search is successful then it replaces that match with the replace-string, and the new string is returned. If there are no matches then the original search-string is returned.

The Replace method takes 2 parameters. If the search is successful then it replaces that match with the replace-string, and the new string is returned. If there are no matches then the original search-string is returned.

The Test method takes a STRING as its argument and RETURNS TRUE if the regular EXPRESSION can successfully be matched against the string, otherwise FALSE is returned.

The Test method takes a string as its argument and returns True if the regular expression can successfully be matched against the string, otherwise False is returned.

Following are the properties of RegExp object:

Pattern: The Pattern method REPRESENTS a string that is USED to define the regular expression and it should be set before using the regular expression object.

IgnoreCase: A Boolean property that represents if the regular expression should be tested against all possible matches in a string if TRUE or false. If not specified explicitly, IgnoreCase VALUE is set to False.

GLOBAL: A Boolean property that represents if the regular expression should be tested against all possible matches in a string. If not specified explicitly, Global value is set to False.

Following are the properties of RegExp object:

Pattern: The Pattern method represents a string that is used to define the regular expression and it should be set before using the regular expression object.

IgnoreCase: A Boolean property that represents if the regular expression should be tested against all possible matches in a string if true or false. If not specified explicitly, IgnoreCase value is set to False.

Global: A Boolean property that represents if the regular expression should be tested against all possible matches in a string. If not specified explicitly, Global value is set to False.

RegExp object helps the DEVELOPERS to MATCH the pattern of strings and the PROPERTIES and methods HELP us to work with Regular Expressions easily.

RegExp object helps the developers to match the pattern of strings and the properties and methods help us to work with Regular Expressions easily.

TextStream enables DEVELOPERS to READ and WRITE text FILES.

TextStream enables developers to read and write text files.

FOLDERS PROVIDES a LIST of all the folders WITHIN a FOLDER.

Folders provides a list of all the folders within a Folder.

FOLDER PROVIDES METHODS and properties that allow developers to create, DELETE or move folders.

Folder provides methods and properties that allow developers to create, delete or move folders.

Files PROVIDES a LIST of all files contained within a FOLDER.

Files provides a list of all files contained within a folder.

File CONTAINS METHODS and properties that allow DEVELOPERS to create, delete or move a file.

File contains methods and properties that allow developers to create, delete or move a file.

Drive CONTAINS METHODS and PROPERTIES that allow you to gather INFORMATION about a drive attached to the system.

Drive contains methods and properties that allow you to gather information about a drive attached to the system.

This class PROVIDES file system OBJECTS which HELP the developers to work with drives, folders and files.

Example:

Dim oFS, DRIVE
Set oFS = CreateObject("Scripting.FileSystemObject")
Set drive = oFS.GetDrive(oFS.GetDriveName("C:"))
Document.write drive.VolumeName

This class provides file system objects which help the developers to work with drives, folders and files.

Example:

Dim oFS, drive
Set oFS = CreateObject("Scripting.FileSystemObject")
Set drive = oFS.GetDrive(oFS.GetDriveName("C:"))
Document.write drive.VolumeName

There are two events that are AUTOMATICALLY associated with every class by default. Class_Initialize and Class_Terminate.

Class_Initialize is TRIGGERED whenever you INSTANTIATE an object based on the class. Class_Terminate event is FIRED when the object goes out of scope or when the object is set to Nothing.

Example:

In the below example, we will make you understand how the events work in VBSCRIPT.

'Instantation of the Object
Set objectname = New classname 

Private Sub Class_Initialize( )
 Initalization code goes here
End Sub
'When Object is Set to Nothing
Private Sub Class_Terminate( )
 Termination code goes here
End Sub

There are two events that are automatically associated with every class by default. Class_Initialize and Class_Terminate.

Class_Initialize is triggered whenever you instantiate an object based on the class. Class_Terminate event is fired when the object goes out of scope or when the object is set to Nothing.

Example:

In the below example, we will make you understand how the events work in VBScript.

'Instantation of the Object
Set objectname = New classname 

Private Sub Class_Initialize( )
 Initalization code goes here
End Sub
'When Object is Set to Nothing
Private Sub Class_Terminate( )
 Termination code goes here
End Sub

Methods allow the class to perform the OPERATION that the developer wants. The Methods are nothing but Functions or Subroutines.

Example:

Class Car
PRIVATE Model
Private Year 
Public Start()
Fuel = 2.45
Pressure = 4.15
END FUNCTION 
End Class

Methods allow the class to perform the operation that the developer wants. The Methods are nothing but Functions or Subroutines.

Example:

Class Car
Private Model
Private Year 
Public Start()
Fuel = 2.45
Pressure = 4.15
End Function 
End Class

Class PROPERTIES, such as Property LET, which handles the process of data VALIDATION and assigning the new value to the private variable. Property set, which assigns the new property value to the private object variable.

Read-only properties have only a Property Get PROCEDURE while write-only properties (which are rare) have only a Property Let or a Property Set procedure.

Example:

Class Comp

Private modStrType
Private OS
 
Public Property Let ComputerType(strType)
modStrType = strType
End Property
 
Public Property Get ComputerType()
ComputerType = modStrType
End Property
 
Public Property Set OperatingSystem(oObj)
Set OS = oObj
End Property
 
Public Property Get OperatingSystem()
Set OperatingSystem = OS
End Property
 
End Class

Class properties, such as Property Let, which handles the process of data validation and assigning the new value to the private variable. Property set, which assigns the new property value to the private object variable.

Read-only properties have only a Property Get procedure while write-only properties (which are rare) have only a Property Let or a Property Set procedure.

Example:

Class Comp

Private modStrType
Private OS
 
Public Property Let ComputerType(strType)
modStrType = strType
End Property
 
Public Property Get ComputerType()
ComputerType = modStrType
End Property
 
Public Property Set OperatingSystem(oObj)
Set OS = oObj
End Property
 
Public Property Get OperatingSystem()
Set OperatingSystem = OS
End Property
 
End Class

VBScript CLASSES are enclosed within CLASS .... END Class
'Defining the Class
Class CLASSNAME 'Declare the object name
...
End Class
' Instantiation of the Class
Set objectname = new classname

VBScript classes are enclosed within Class .... End Class
'Defining the Class
Class classname 'Declare the object name
...
End Class
' Instantiation of the Class
Set objectname = new classname

Class is a construct that is USED to define a unique type. Like Object Oriented Programming, VbScript 5.0 supports the creation of classes and it is very similar to writing COM objects with VB.

Class is simply the template for an object and we instantiate an object to access the PROPERTIES and methods of it. Classes can CONTAIN variables, properties, methods or EVENTS.

Class is a construct that is used to define a unique type. Like Object Oriented Programming, VbScript 5.0 supports the creation of classes and it is very similar to writing COM objects with VB.

Class is simply the template for an object and we instantiate an object to access the properties and methods of it. Classes can contain variables, properties, methods or events.

In order to destroy the objects, we need to use Set Keyword followed by the OBJECT NAME and point it to Nothing.

EXAMPLE:

DIM obj
Set obj = CreateObject("Scripting.Dictionary")
Set obj = Nothing

In order to destroy the objects, we need to use Set Keyword followed by the object name and point it to Nothing.

Example:

Dim obj
Set obj = CreateObject("Scripting.Dictionary")
Set obj = Nothing

we NEED to declare the OBJECT and instantiate it using Set KEYWORD.

Example:

DIM obj
Set obj = CreateObject("Scripting.Dictionary")

we need to declare the object and instantiate it using Set Keyword.

Example:

Dim obj
Set obj = CreateObject("Scripting.Dictionary")

If BYREF is SPECIFIED, then the arguments are sent as by reference when the FUNCTION or PROCEDURE is CALLED.

If ByRef is specified, then the arguments are sent as by reference when the function or procedure is called.

If ByVal is SPECIFIED, then the ARGUMENTS are SENT as by VALUE when the FUNCTION or procedure is called.

If ByVal is specified, then the arguments are sent as by value when the function or procedure is called.

• Sub Procedures are SIMILAR to functions but there are few DIFFERENCES.
• Sub procedures DONOT Return a value while functions may or may not return a value.
• Sub procedures Can be called WITHOUT call KEYWORD.
• Sub procedures are always enclosed within Sub and End Sub statements.

Yes! A FUNCTION can return multiple VALUES SEPARATED by COMMA as an ARRAY assigned to the function name itself.

Yes! A function can return multiple values separated by comma as an array assigned to the function name itself.

To return a value from a FUNCTION, SIMPLY ASSIGN the value to the function NAME itself.

To return a value from a function, simply assign the value to the function name itself.

To invoke a function somewhere LATER in the script, you would simple need to write the NAME of that function with the CALL keyword.

To invoke a function somewhere later in the script, you would simple need to write the name of that function with the Call keyword.

The most COMMON way to define a function in VBScript is by using the Function KEYWORD, FOLLOWED by a unique function name and it may or may not carry a LIST of parameters and a statement with a End Function keyword, which indicates the end of the function.

The most common way to define a function in VBScript is by using the Function keyword, followed by a unique function name and it may or may not carry a list of parameters and a statement with a End Function keyword, which indicates the end of the function.

USING Erase Function, which RECOVERS the allocated memory for the ARRAY variables.

Using Erase Function, which recovers the allocated memory for the array variables.

USING IsArray FUNCTION, which returns a BOOLEAN VALUE that indicates whether or not the input variable is an array.

Using IsArray function, which returns a boolean value that indicates whether or not the input variable is an array.

Using Filter FUNCTION, RETURNS a zero based ARRAY that CONTAINS a subset of a STRING array based on a specific filter criteria.

Using Filter function, returns a zero based array that contains a subset of a string array based on a specific filter criteria.

Using Join function, which returns a String that CONTAINS a specified number of substrings in an ARRAY. This is an exact opposite function of SPLIT METHOD.

Using Join function, which returns a String that contains a specified number of substrings in an array. This is an exact opposite function of Split Method.

Using Split FUNCTION, which returns an ARRAY that contains a specified NUMBER of values. Splitted BASED on a DELIMITER.

Using Split function, which returns an array that contains a specified number of values. Splitted based on a Delimiter.

Using UBound function, which RETURNS an INTEGER that corresponds to the largest subscript of the GIVEN arrays.

Using UBound function, which returns an integer that corresponds to the largest subscript of the given arrays.

USING LBound function, which RETURNS an integer that corresponds to the SMALLEST subscript of the GIVEN arrays.

Using LBound function, which returns an integer that corresponds to the smallest subscript of the given arrays.

USING ReDim STATEMENT, we can declare dynamic-array VARIABLES and allocate or reallocate storage SPACE.

Using ReDim statement, we can declare dynamic-array variables and allocate or reallocate storage space.

The VALUES are ASSIGNED to the array by specifying array index value against each ONE of the values to be assigned.

Example:

Dim arr(5)
arr(0) = "VBScript" 'String
document.write("Value STORED in Array index 0 : " & arr(0) & "<br /&GT;")

The values are assigned to the array by specifying array index value against each one of the values to be assigned.

Example:

Dim arr(5)
arr(0) = "VBScript" 'String
document.write("Value stored in Array index 0 : " & arr(0) & "<br />")

arrays are declared the same WAY a variable has been declared except that the DECLARATION of an array variable USES parenthesis. In the below example, the size of the array is mentioned in the brackets.

Example:

'Method 1 : USING Dim
Dim arr1() 'Without Size
'Method 2 : Mentioning the Size
Dim arr2(5) 'Declared with size of 5
'Method 3 : using 'Array' Parameter
Dim arr3
arr3 = Array("apple","Orange","Grapes")

arrays are declared the same way a variable has been declared except that the declaration of an array variable uses parenthesis. In the below example, the size of the array is mentioned in the brackets.

Example:

'Method 1 : Using Dim
Dim arr1() 'Without Size
'Method 2 : Mentioning the Size
Dim arr2(5) 'Declared with size of 5
'Method 3 : using 'Array' Parameter
Dim arr3
arr3 = Array("apple","Orange","Grapes")

Using StrReverse function, WHIHC RETURNS a String after REVERSING the sequece of the characters of the given string.

Using StrReverse function, whihc returns a String after reversing the sequece of the characters of the given string.

Using STRING function, which RETURNS a String with a specified CHARACTER the specified NUMBER of TIMES.

Using String function, which returns a String with a specified character the specified number of times.

The StrComp FUNCTION returns an integer value after comparing the two given STRINGS. It can return any of the three values -1, 0 or 1 based on the INPUT strings to be COMPARED.

• If String 1 < String 2 then StrComp returns -1
• If String 1 = String 2 then StrComp returns 0
• If String 1 > String 2 then StrComp returns 1

The StrComp Function returns an integer value after comparing the two given strings. It can return any of the three values -1, 0 or 1 based on the input strings to be compared.

Using StrComp function, which RETURNS an integer VALUE after COMPARING the TWO specified strings.

Using StrComp function, which returns an integer value after comparing the two specified strings.

Using SPACE FUNCTION, which FILLS a STRING with the specified NUMBER of spaces.

Using Space function, which fills a string with the specified number of spaces.

USING Replace FUNCTION, which RETURNS a string after replacing a string with another string.

Using Replace function, which returns a string after replacing a string with another string.

Using LEN function, which returns the LENGTH of the given STRING.

Using Len function, which returns the length of the given string.

Using TRIM function, which returns a STRING VALUE after removing both leading and TRAILING blank SPACES.

Using Trim function, which returns a string value after removing both leading and trailing blank spaces.

Using Rtrim function, which RETURNS a string after REMOVING the spaces on the LEFT SIDE of the specified string.

Using Rtrim function, which returns a string after removing the spaces on the left side of the specified string.

USING LTRIM function, which returns a string after removing the spaces on the LEFT side of the SPECIFIED string.

Using Ltrim function, which returns a string after removing the spaces on the left side of the specified string.