Convert A Pair Of True/False Conditions Into An Appropriate Message

Sometimes you want to translate a true/false boolean condition into an
equivalent text message. This is simple with just one true/false value:

TruthMessage := @If( Booleanvalue ; "True message" ; "False message")

But how do you handle multiple boolean values that combine in multiple ways?
For example, a pair of Boolean variables, NorthBool and SouthBool, give rise to
four possible messages, depending on whether both are True, both are False,
NorthBool only is true, or SouthBool only is true. Without using a complex nest
of @If functions, the following formula code produces an appropriate message
for each combination. It is generic and can be used for multiple Boolean

Choices := "Neither":"North Only":"South Only":"Both";
Index := ?SouthBool*2 + NorthBool + 1;
TruthMessage := @Subset(@Subset(Choices;Index); -1)

This was first published in November 2000

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.