Recent Updates (近況報告)

2014/09/21 RubyHiroba2014

Transcript

1. ۙگใࠂ (Latest News) ɹ Yutaka HARA ωοτϫʔΫ Ԡ༻௨৴ݚڀॴ 2014/09/21 RubyHiroba2014
2. Attendees from Matsue office — @nacl — @yukihiro_matz — @shugomaeda — @takaokouji — @nobyuki — @nari3 — @yhara (me)
3. http://www.netlab.jp/recruit
4. My current project — github:yhara/boom — Toy language with type inference — Will resume it as soon as I quit Ingress
5. Recent interests 1. "Ruby and Patten Match" 2. "Ideal way to map a hash" 3. "Opal the Ruby to JS compiler"
6. 1. Ruby and Patten Match
7. Ruby HAS pattern match (via gem) — pattern-match gem (@k_tsj) — patm gem (@todesking, limited but faster) — egison gem (@__Egi, RubyKaigi Day 1)
8. ɹ Pattern Match is like Regexp for Objects
9. Match regexp against string ʮIf the string is like thisʯ str = "add 1 2" if str =~ /add (\d+) (\d+)/ puts "Add #{$1} and #{$2}" end
10. Match pattern against array ʮIf the array is like thisʯ require 'pattern-match' ary = [:add, 1, 2] match(ary){ with(_[:add, x, y]){ puts "Add #{x} and #{y}" } }
11. Match pattern against your class class Book # has :title, :price ... def self.deconstruct(val) accept_self_instance_only(val) return [val.title, val.price] end end book = Book.new("Programming Ruby", 3400) match(book){ with(Book.(/Ruby/, 0..5000)) { p book } }
12. Try it now. $ gem install pattern-match require 'pattern-match' match(1){ with(x){ p x } } github:k-tsj/pattern-match
13. 2. Ideal way to map a hash
14. My proposals accepted — #1961 __dir__ — #4890 Enumerable#lazy — #6670 String#lines should return array and one more challenge:
15. Current hash.map — How to convert {:a => 1, :b => 2} into {"a" => 1, "b" => 2} h = {:a => 1, :b => 2} pairs = h.map{|k, v| [k.to_s, v] } #=> [["a", 1], ["b", 2]]
16. Hash#[] h = {a: 1, b: 2} pairs = h.map{|k, v| [k.to_s, v] } #=> [["a", 1], ["b", 2]] Hash[pairs] #=> {"a" => 1, "b" => 2}
17. Enumerable#to_h (Ruby >= 2.1) h = {a: 1, b: 2} pairs = h.map{|k, v| [k.to_s, v] } #=> [["a", 1], ["b", 2]] pairs.to_h #=> {"a" => 1, "b" => 2}
18. Ideal way h = {a: 1, b: 2} h.xxxxxx{|k, v| [k.to_s, v] } #=> {"a" => 1, "b" => 2} xxxxxx == hash_map, map_hash, hash_by, morph, apply, map_kv, ...???
19. Join bugs.ruby-lang.org — Feature #10208: Passing block to Enumerable#to_h — Feature #6669: A method like Hash#map but returns hash We need a good name :-( Any ideas?
20. 3. Opal the Ruby to JS compiler
21. http://opalrb.org/
22. http://opalrb.org/ — Compiler from Ruby to JavaScript — Some difference, but mostly Ruby — String is immutable, etc.
23. Why Opal matters #1 JavaScript x HTML5 JavaScript x WebSocket JavaScript x WebRTC JavaScript x Mobile ...
24. Why Opal matters #1 Ruby(Opal) x HTML5 Ruby(Opal) x WebSocket Ruby(Opal) x WebRTC Ruby(Opal) x Mobile ...
25. Why Opal matters #2 — Two languages [Client] [Server] JavaScript ---> Rails(Ruby) <---
26. Why Opal matters #2 — One language! [Client] [Server] Opal(Ruby) ---> Rails(Ruby) <---
27. One language for C/S — No context switch — Share logic among C/S (validation, etc.) — Pre-render view on the server side cf. Rendr, Meteor (Node.js)
28. Related products Check it out! — For #1: github:yeahrb/yeah "Practical Ruby video game framework" — For #2: github:voltrb/volt "A ruby web framework where your ruby runs on both server and client"
30. Yeahrb Demo $ gem i yeah $ yeah new hello $ cd hello $ yeah serve $ open http://localhost:1234 $ vi code/game.rb
31. Yeahrb Demo code/game.rb: class Hello1 < Game def setup end def update(elapsed) display.fill_color = C[255,255,255] display.fill_rectangle(V[0,0], display.size) end end
32. Yeahrb Demo Feels like so Ruby that you never want to go back to JavaScript :-)
33. ۙگใࠂ: I'm enjoying programming.