Private words
Factor handbook > The language > Syntax > Parse-time word lookup

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Words which only serve as implementation detail should be defined in a private code block. Words in a private code blocks get defined in a vocabulary whose name is the name of the current vocabulary suffixed with .private. Privacy is not enforced by the system; private words can be called from other vocabularies, and from the listener. However, this should be avoided where possible.
<PRIVATE

PRIVATE>