not ( obj -- ? )
Factor handbook > The language > Booleans

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Vocabulary
kernel

Inputs and outputs
obja generalized boolean
?a boolean


Word description
For f outputs t and for anything else outputs f.

Notes
This word implements boolean not, so applying it to integers will not yield useful results (all integers have a true value). Bitwise not is the bitnot word.

Definition

: not ( obj -- ? ) [ f ] [ t ] if ; inline