Do..Loop - VBScript

Overview

The Do..Loop command in VB Script creates a loop structure for executing a set of statements repeatedly until a specified condition is met. It is useful when the number of iterations is unknown or when you need to repeat a block of code based on a loop counter.

Syntax

Do [While | Until] condition
    [statements]
Loop

Parameters:

• condition: Determines whether to continue the loop. Can be a logical expression or a comparison.
• While: Executes the loop as long as the condition remains true.
• Until: Executes the loop until the condition becomes true.
• statements: The code to be executed within the loop.

Options/Flags

There are no options or flags associated with the Do..Loop command.

Examples

Simple loop with a counter:

Dim i
Do While i < 10
    Debug.Print i
    i = i + 1
Loop

Loop until a condition is met:

Do Until InputBox("Enter 'Quit' to exit") = "Quit"
    ' Inside the loop...
Loop

Common Issues

• Ensure that the loop condition eventually evaluates to False (Do While) or True (Do Until) to prevent infinite loops.
• Avoid using Exit For or Exit Do within a nested loop, as it may exit the wrong loop.

Integration

The Do..Loop command can be combined with other VB Script constructs, such as Select Case or If..Then statements, for more complex loop control.

Related Commands

• For..Next: A more straightforward loop structure with a known number of iterations.
• Do While..Loop: Similar to Do..Loop but only executes the loop if the condition is initially true.