And Then Operator

Returns “false” if one or more Boolean expressions are false, but stops after the first false expression.

Syntax

expression_1 And Then expression_2

Parts

expression_1
A Boolean expression.
expression_2
A Boolean expression.

Instructions

The result has the type Boolean.

And Then is almost the same as the operator And. They are different when expression_1 is false. When this occurs, expression_2 is not calculated. This is correct because if one expression is false, then the result is always false. This is known as short-circuit evaluation.

Truth table for expression_1 And Then expression_2
If expression_1 is And expression_2 is Then the result is
TrueTrueTrue
TrueFalseFalse
Falsenot calculatedFalse

Examples

Example 1

In this example, “parts” was supplied by the user.

If parts > 0 And Then all / parts >= minimum Then
    ' do something
End If

Example 2

If #h Is Object And Then #h.SomeMethod? Then
    ' do something
End If

See also