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IBM Domino Designer Basic User Guide and Reference
Basic product usage information and programming language reference information.
Formula Language
This section documents the formula language.
Formula Language Coding Guidelines
Formulas
A formula consists of one or more statements that are executed in order. Depending on the object associated with the formula and other criteria, the formula may execute once or it may execute multiple times on selected documents (one execution per document).
Using conditional statements
Examples: Using conditional statements

Examples: Using conditional statements

This agent example compares the number of elements in Categories to 0. If the field has elements, it is not changed (it is set to itself). If the field does not have elements, it is set to a constant string.
```
FIELD Categories := @If(@Elements(Categories) > 0; Categories; "To be supplied ...");
SELECT @All
```
This window title example first checks the return value of @IsNewDoc. If the document is new, the window title is set to the text constant "New Topic." If the document already exists, the window title is set to the Subject field if the current view is AuthorView. Otherwise, the window title is set to the Subject field followed by a string denoting the number of response documents.
```
StandardTitle := Subject + @DocDescendants(" (No Responses)"; " (1 Response)"; " (% Responses)");
@If(@IsNewDoc; "New Topic"; @ViewTitle = "AuthorView"; Subject; StandardTitle)
```