Beyond Ruby

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

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

@konstantinhaase github.com/rkh

@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

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

@konstantinhaase github.com/rkh Tell you something new

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

@konstantinhaase github.com/rkh Full Object Orientation

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

@konstantinhaase github.com/rkh OOP ≠ OOP

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

@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

@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

@konstantinhaase github.com/rkh Smalltalk

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

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

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

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

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

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

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

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

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

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

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

@konstantinhaase github.com/rkh Newspeak

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

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

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

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

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

@konstantinhaase github.com/rkh Homoiconic Languages

@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

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

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

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

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

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

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

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

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

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

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

@konstantinhaase github.com/rkh Declarative Programming

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

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

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

@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]

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

@konstantinhaase github.com/rkh Hardware Programming

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

@konstantinhaase github.com/rkh FOO <= '1'; BAR <= '0'; BAZ <=
FOO and BAR;

@konstantinhaase github.com/rkh github.com/a-team/Pong

@konstantinhaase github.com/rkh Thank you!

Beyond Ruby

Beyond Ruby

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