"Dim x()" - Declaring Array Variables
This section provides an introduction and examples on how to declare array variables with fixed sizes or dynamic sizes.
VBScript supports 2 ways to declare an array variable:
1. Explicit Declaration with Fixed Size - Using "Dim" statement with size included as:
where "upper_bound" is positive integer specifying the upper bound of the element index.
Array declared in this way has a fixed size (number of elements).
By default, the size of an array is the upper bound plus 1, because index starts from 0.
This size can not be changed.
2. Explicit Declaration with Dynamic Size - Using "Dim" and "ReDim" statements as shown
in the following syntax:
ReDim [Preserve] variable_name(upper_bound)
The "Dim" statement declares an array variable without any upper bound. The "ReDim" statement resets
the upper bound to a new value. The optional key word "Preserve" specifies that all old elements
must be preserved when resetting the array size. Array declared in this way can be resized at any time.
VBScript offers some other useful functions and statements for you to work with arrays:
- IsArray(variable_name) - Returns "True" if the specified value is an array.
- UBound(array_variable) - Returns the upper bound of the specified array.
- LBound(array_variable) - Returns the lower bound of the specified array.
- "For Each" - Loops through all elements in an array.
- "Erase" - Removes all values from an array.
See sections below for details and examples on those functions and statements.
Table of Contents
About This Book
Introduction of VBScript - Visual Basic Scripting Edition
Variant Data Type, Subtypes, and Literals
Numeric Comparison Operations and Logical Operations
String Operations - Concatenation and Comparison
Variable Declaration and Assignment Statement
Expression and Order of Operation Precedence
Statement Syntax and Statement Types
►Array Data Type and Related Statements
What Is an Array?
►"Dim x()" - Declaring Array Variables
"x(i)" - Accessing Array Elements with Indexes
"Dim x(n)" - Fixed-Size Array Example
"Dim x()" - Dynamic-Size Array Example
"For Each" Statement Example
"Erase" Statement - Removing All Elements in an Array
Data Type "Variant()" - Array of Variant Values
Array References and Array Assignment Statements
Conditional Statements - "If ... Then" and "Select Case"
Loop Statements - "For", "While", and "Do"
"Function" and "Sub" Procedures
Inspecting Variables Received in Procedures
Error Handling Flag and the "Err" Object
Regular Expression Pattern Match and Replacement
scrrun.dll - Scripting Runtime DLL Library
Creating Your Own Classes
IE Web Browser Supporting VBScript
IIS ASP Server Supporting VBScript
WSH (Windows Script Host)
PDF Printing Version