VBScript Syllabus

VBScript Syllabus, VBScript Syntax, Coding Conventions, Variables, Constants, Operators, Functions, Control Flow, and Automation Object Models.

VBScript Syllabus for Beginners

1. Adding Comments

Purpose of Comments: To make the code readable and to make the code disable from Execution.

2. Data Types

No Data type specification in VBScript, VBScript considers data subtypes based on usage of the Data, and using VarType function user can check the data subtypes.

3. Varaibles

VBScript supports Explicit and Implict Declaratio of Variables

a) Constants
Built-in
User-defined

b) Variables
Scalar Variables
Array variables
* Dictionary object is equivalent to Hash variables/ Associated Arrays in Perl Script.

4. VBScript Operators

Categories of Operators

a. Arithmetic operators
b. Comparison operators
c. Logical operators

Note: Concatenation operators (Part of Arithmetic operators)

5. Control Flow – Decision Making/Conditional Statements

a. Types of conditional statements

i. If statement
ii. Select Case statement

b. Types of conditions

i. Single condition
ii. Compound condition
iii. Nested condition

c. Usage of Conditional statements

i. Execute a statement when the condition is true/simple if
ii. Execute a block of statements when condition True.
iii. Execute a block of statements when condition True, otherwise execute another block of statements.
iv. Decide among several alternates (Elseif)
v. Execute a block of statements when more than one condition is True (Nested If)
vi. Decide among several alternates (Using select Case)

6. Control Flow – Loop Statements

Four Loops Structures in VBScript

a. For…Next
b. While…Wend
c. Do While / Until…Loop
d. For Each…Next

Note: Using Exit Statement we can terminate the loops. We can insert Loop statements within conditions and vice versa.

7. VBScript Functions

The function is a Reusable code, whenever we want to execute the same operations multiple times then we prefer functions.

Types of functions

a. Built-in Functions

i. Array Functions
ii. String functions
iii. Date & Time functions
iv. Conversion functions
v. I/O Functions
vi. Math Functions
vii. Miscellaneous functions

b. User-defined Functions

i. Sub Procedures
Public, Private – Access control
Internal, External – Usage

ii. Function Procedures
Public, Private – Access control
Internal, External – Usage

8. Coding conventions

Writing comments

Naming conventions etc…

ex:

Dim num, city, Fso ‘Without standards

Dim intNum, strCity, objFso -With naming standards

9. File System Operations

> What is Computer File System?

> Examples for File System Operations

> How end-user performs File System Operations

> How to perform automatic File System Operations

Using File System Object we can perform automatic File System Operations

Class value for creating File System Object – (“Scripting.FileSystemObject”)

Set Variable = CreateObject(“Scripting.FileSystemObject”)

Set is VBScript statement

CreateObject is Built function

10. Excel Application Operations

Excel Application Object:

It is used to perform operations on Excel Application/Excel files

Class Value for creating Excel Application object – (“Excel.Application”)

11. Word Application operations

Word Application Object

It is used to perform operations on Word Application / Word documents.

Class value for creating Word Application object – (“Word.Application”)

12. Database operations

a. Database Connection Object

It is used to connect to Databases

Note: Connection string only varies from One Database to another.

Class value for creating database connection object – (“Adodb.Connection”)
———-
b. Database Recordset Object

It is used to perform operations on Database Records.

Class value for creating Database Recordset object – (“Adodb.Recordset”)

13. Dictionary Object

It is used to define key, value pairs.

Class value – (“Scripting.Dictionary”)

14. Regular Expressions

Regular Expression – It is a formula for matching patterns

Constant matching –

india.doc – india.doc

Pattern matching

i*.

ia…..
ib……….
.
.
india.doc

15. Error Handling

Handling expected and unexpected Errors.

Expected Error:

Whenever we use invalid input then we can expect the Error.

Note: We use Invalid Input for Negative Testing
—————-
Unexpected Error:

Scenarios:

i) Availability of the Resource

ii) Resource Response

iii) Insufficient Resource.

VBScript features for Error Handling:

a) Conditional statements

b) Using some built-in Functions

c) Using Exit Statement

d) Using Option explicit statement

e) Using On Error Resume Next

Etc…


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