Anyone interested in Smalltalk as a functional programming language
should contrast Smalltalk-80 with -72, specially as described in "The
Early History of Smalltalk" by Alan Kay. That early version didn't have
individual methods and one possible programming style was to use a class
as a function (with a very Logo-like syntax). The earlier -71 design
(never actually implemented) with its pattern matching looked even more
like currently popular functional languages.

-- Jecel