'''[http://factorcode.org/%|%Factor]''' is a concatenative programming language. Like [Tcl], it is something of a chameleon, serving as a layer upon which facilities for various programming paradigms can be built. As a [stack]-based language, it also shares some of the core characteristics of [Forth]. Like Tcl, one of its fundamental syntactic units is the [word]. ** Reference ** [http://factor-language.blogspot.com/2009/04/sup-dawg-we-heard-you-like-smalltalk-so.html%|%Sup dawg, we heard you like Smalltalk so we put Smalltalk in your Factor so you can send messages while you roll], Slava Pestov, 2009: presents a toy implementation of [Smalltalk] in Factor. <> Programming Language