If Unknown checks whether a value is unknown. If so, the result is a second value. If the value is not unkown, that value is returned.

Syntax

Value1 ? Value2

Returns

Returns Value2 if Value1 is unknown. Otherwise Value1 is returned.

Examples

text ? "Please enter a value" 

/* If `text` is unknown then the result is "please enter a value". If `text` is not unknown then `text`' is the result. */

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Videos and images courtesy of WEM Modeler.
© 2019 WEM Modeler.
SitemapPrivacy - Terms - Company