quotations are lambdas, abuse them
Most challenges can be solved with one word definition because of Factor's functional, applicative nature.
I just had the sudden realisation that [ quoting ] code is the equivalent of a lambda definition in other languages.
I don't know why I didn't think of this before...
A normal word definition:
: f ( a c -- b ) asd asd ;
Lamba'd:
[ asd asd ]
You can do everything inside a [ quotation ] that you can inside a : word.