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Computing with ioLProgrammer's GuideLanguage Reference

abs tag   add tag   align field   and tag   array tag   audio tag   backgroundColor field   bold field   border field   borderBottom field   borderColor field   borderLeft field   borderRight field   borderStyle field   borderTop field   bottom field   box tag   button tag   carat field   checkBox tag   choiceBox tag   class tag   clear tag   clientFrame tag   color field   console tag   dialog tag   div tag   do field   ellipse tag   else field   eq tag   false tag   focus field   focusOrder field   font field   for tag   ge tag   gt tag   height field   hotKey field   if tag   img tag   inf tag   inline field   input tag   invalid tag   int tag   italic field   join tag   layer field   le tag   left field   limit field   line tag   lt tag   margin field   marginBottom field   marginLeft field   marginRight field   marginTop field   mod tag   mul tag   ne tag   neg tag   not tag   null tag   num tag   onClear field   onClick field   onCommit field   onContextClick field   onExit field   onFocus field   onGet field   onKeyDown field   onKeyPress field   onKeyUp field   onMouseDown field   onMouseIn field   onMouseMove field   onMouseOut field   onMouseUp field   onPull field   onPush field   onResize field   onTimer field   openLink tag   or tag   pivot field   playing field   put tag   putError tag   putLn tag   requestTransfer tag   right field   rotate field   scalar tag   scroll field   scrollPos field   selectable field   spacing field   spacingBottom field   spacingLeft field   spacingRight field   spacingTop field   span tag   split tag   sub tag   table tag   tabRow tag   then field   timer tag   top field   transfer tag   transferAbility tag   transition field   true tag   underline field   vector tag   video tag   visible field   void tag   width field   with field   xor tag


void tag

Category: ephemeral logic tag

The void tag absorbs any values produced by the contents of its primary field and discards them. It does not produce any values.

Sample usage

Fields

Primary field

Behavior

The void tag is useful for wrapping around operations that would normally produce values, but the values produced are not needed or wanted. The void tag absorbs any produced values so they do not spill out and pollute the console.

Notes

Example

In the following example, a dialog box needs to be displayed to tell the user a certain action can't be performed. The dialog tag normally produces a result so the program can tell what response the user has selected. In this case the user only has one option to choose from—to close the dialog box after reading it—so we have no use for the value produced by the dialog tag and need to get rid of it somehow. The void tag is compounded with the dialog tag to allow the dialog to be displayed but destroy the value produced by the user's interaction.

<void|dialog {Function disabled. Try a different function.}>