REBOL 3 Docs Guide Concepts Functions Datatypes Errors
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REBOL 3 Functions: none?

none?  value

Returns TRUE if it is this type.

Arguments:

value [any-type!]

See also:

Description

Returns FALSE for all other values.

print none? NONE
true
print none? pick "abc" 4
true
print none? find "abc" "d"
true


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