Statements

Parent page: VBScript

VBScript Statements

This section of the VBScript reference includes VBScript:
Conditional Statements
Expressions and Operators

Conditional Statements

The main conditional statements supported by VBScript are:

• If...Then
• For Next Loop
• Exit For
• For Each Next
• Do Loop
• While...WEnd
• Select Case

Care needs to be taken to code scripts that avoid infinite loops — that is, ensuring that the conditions will eventually be met.

The If...Then statement

The syntax is:

 If Condition Then   'code Else If AnotherCondition Then   'code Else   'code End If

The For loop

The For Next statement repeatedly loops through a block of code. The basic syntax is:

 For counter = start to end   ' block of code here Next

The Exit For

The Exit For statement exits a For loop prematurely.

 For counter = start to end   if condition then Exit For Next

The For Each loop

The For Each loop is a variation on the For loop which is designed to iterate through a collection of objects as well as elements in an array. The basic syntax is:

 For Each ObjectVar in Collection   ' block of code here Next

The Do loop

The Do Loop has several loop variations.

 Do while until condition   ' code block Loop

...and;

 Do   ' code block Loop while until condition

...and;

 Do   ' code block Loop

The While...WEnd loop

The While WEnd statement repeatedly loops through a block of code. The basic syntax is;

 While until condition   ' code block WEnd

The Select Case statement

You can use the SELECT statement if you want to select one of many blocks of code to execute:

 Select case payment   case "Cash"     msgbox "pay cash"   case "MasterCard"     msgbox "pay by Mastercard"   case Else     msgbox "Unknown payment method" end select

Expressions and Operators

An expression is a valid combination of constants, variables, literal values, operators and function results. Expressions are used to determine the value to assign to a variable, to compute the parameter of a function, or to test for a condition. Expressions can include function calls.
VBScript has a number of logical, arithmetic, Boolean and relational operators. Since these operators are grouped by the order of precedence which is different to the precedence orders used by Basic, C etc. For example, the AND and OR operators have precedence compared to the relational one.

Arithmetic Operators

Comparison Operators (lowest precedence)

String Operators

Logical Operators