Paul Thurrott's Internet Nexus >> Books >> VBScript: A Visual QuickStart Guide >> Chapter 3: Using Loops and Conditionals

Chapter 1: Using Loops and Conditionals
Chapter 3 introduces the conditional code execution and looping constructs provided by Visual Basic Script. These capabilities allow you to make decisions and execute blocks of code accordingly.

Making a simple decision with If-Then
The most common way to execute conditional code is with the If-Then statement. This example makes a simple decision and writes the appropriate text to the browser. (Note: This version includes fixes bugs found in the book). Page 27.
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Making a more complex decision with If-Then-Else and If-Then-ElseIf
While the previous example works, it's not technically the best way to make more than one decision. This example introduces the Else and ElseIf clauses, which make multiple decisions more simple. Page 28.
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Using Select Case to make decisions
VBScript provides an even more elegant way to make decisions, the Select Case statement, which is ideal for a long list of possible outcomes. Page 29.
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Looping with Do-Until
Do Until is the simplest looping construct in VBScript. It allows you to execute code until a certain condition is met. Page 30.
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Looping with Do-While
The most versatile VBScript loop is Do While, which repeats a block of code while a certain condition is true. The example here is slightly different than that found in the book, reflecting the prefered way to use this construct. Page 31.
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Looping with While-Wend
The Do-While loop's inbred step-brother, the While-Wend loop isn't used very often. I recommend Do-While instead. Page 32.
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Using the For-Next Loop
The For-Next loop is easily the most widely used and recognized looping construct. Pages 33-34.
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