Beyond Ruby - Speaker Deck

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@konstantinhaase github.com/rkh Beyond Ruby Exploring New Territories

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@konstantinhaase github.com/rkh Konstantin Haase Open Source Developer

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh “Second to K&R, the most lagom technical book I’ve read.” Peter Cooper (Ruby Inside) Discount Code: AUTHD 50% off ebook ($6.50) 40% off print

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh A Programming Language is just a Tool

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@konstantinhaase github.com/rkh Tell you something new

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@konstantinhaase github.com/rkh No Node.js No Erlang No Go

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@konstantinhaase github.com/rkh Full Object Orientation

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@konstantinhaase github.com/rkh Doesn’t Ruby already have that?

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@konstantinhaase github.com/rkh OOP ≠ OOP

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@konstantinhaase github.com/rkh “Objects are data and functionality” Your High School Teacher

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh “I made up the term object-oriented, and I can tell you, I did not have C++ in mind.” Alan Kay

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@konstantinhaase github.com/rkh “ OOP to me means only messaging, local retention and protection and hiding of state-process, and extreme late-binding of all things.” Alan Kay

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@konstantinhaase github.com/rkh Smalltalk

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@konstantinhaase github.com/rkh if response == 42 "correct!" else "wrong" end

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@konstantinhaase github.com/rkh response = 42 ifTrue: [ 'correct!' ] ifFalse: [ 'wrong' ]

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@konstantinhaase github.com/rkh def true.if_true yield end def false.if_true end

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@konstantinhaase github.com/rkh TrueClass. define_method(:if_true){ yield } FalseClass. define_method(:if_true) { }

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@konstantinhaase github.com/rkh class Falsy def if_true; end end

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@konstantinhaase github.com/rkh x = Delegator.new({}) x.is_a? Hash # => true case x when Hash then ... else fail end

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@konstantinhaase github.com/rkh Do not treat Objects like Data Structures!

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@konstantinhaase github.com/rkh my_instance. properties[:foo][1,4] == "blah" my_instance.foo? "blah"

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@konstantinhaase github.com/rkh Is Smalltalk Object Oriented?

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@konstantinhaase github.com/rkh variable/constant access is no method send keywords like self and super are no method sends

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@konstantinhaase github.com/rkh no implementation treats ifTrue: and ifFalse: as method sends constants are not late bound

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@konstantinhaase github.com/rkh Newspeak

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@konstantinhaase github.com/rkh there are only method sends there is no global state

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@konstantinhaase github.com/rkh But I want lexical scope!

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@konstantinhaase github.com/rkh Foo = 42 class Bar def foo(x) Foo + x end end

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@konstantinhaase github.com/rkh Outer = 23 module Wrapper Inner = 42 class Nested def result Outer + Inner end end end

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@konstantinhaase github.com/rkh Solution: Clever, Bi- Directional Dispatch

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh Homoiconic Languages

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@konstantinhaase github.com/rkh "In computer programming, homoiconicity is a property of some programming languages, in which the primary representation of programs is also a data structure in a primitive type of the language itself, from the Greek words homo meaning the same and icon meaning representation. This makes metaprogramming easier than in a language without this property." Wikipedia

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@konstantinhaase github.com/rkh Lisp, Logix, Io Prolog, Snobol, Ioke

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh '(1 2 3)

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@konstantinhaase github.com/rkh (+ 1 2) ; 3

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@konstantinhaase github.com/rkh (setf b 23)

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@konstantinhaase github.com/rkh (car '(1 2)) ; 1 (cdr '(1 2)) ; '(2)

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@konstantinhaase github.com/rkh (car (cdr '(1 2)))

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@konstantinhaase github.com/rkh (setf a '(setf b 23)) (eval a)

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@konstantinhaase github.com/rkh (setf a '(setf b 23)) (setf (car (cdr (cdr a))) 42) (eval a)

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh How’s that useful?

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@konstantinhaase github.com/rkh Macros and Partial Evaluation Language Extensions from within

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@konstantinhaase github.com/rkh Declarative Programming

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@konstantinhaase github.com/rkh SQL, XSLT, SPARQL, Pig Prolog, Erlang

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh

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@konstantinhaase github.com/rkh ruby_core(tenderlove). ?- ruby_core(tenderlove). Yes ?- ruby_core(X). X = tenderlove

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@konstantinhaase github.com/rkh ruby_core(tenderlove). rails_core(tenderlove). ubercore(X) :- ruby_core(X), rails_core(X). ?- ubercore(X). X = tenderlove

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@konstantinhaase github.com/rkh car([H|_], H). cdr([_|T], T). ?- car([1, 2, 3], X). X = 1 ?- cdr([1, 2, 3], X). X = [2, 3]

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@konstantinhaase github.com/rkh sorted([]). sorted([_]). sorted([X,Y|T]) :- X =< Y, sorted([Y|T]). sort(X,Y) :- perm(X,Y), sorted(Y).

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@konstantinhaase github.com/rkh Hardware Programming

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@konstantinhaase github.com/rkh VHDL Very-high-speed integrated circuits Hardware Description Language