REBOL 3 Docs Guide Concepts Functions Datatypes Errors
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REBOL 3 Functions: unset?

unset?  value

Returns TRUE if it is this type.

Arguments:

value [any-type!]

See also:

value?  

Description

Returns TRUE if a value is UNSET. Normally you should use VALUE? to test if a word has a value.

if unset? do [print "test"] [print "Nothing was returned"]
test


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