This is a neat case where there's exactly two reasons why a value could be empty. But in other cases there could be many different scenarios.
If you really want to use your own "empty" value, you can simply construct a symbol to represent that specific state
let no_selection = Symbol("User did not make a selection") // or just undefined let undisclosed = Symbol("User prefers not to share this information")
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This is a neat case where there's exactly two reasons why a value could be empty. But in other cases there could be many different scenarios.
If you really want to use your own "empty" value, you can simply construct a symbol to represent that specific state