西日暮里.rb 1周年記念回LT Crystal

Transcript

1. Crystal @ariarijp
2. w !BSJBSJKQ 5BLVZB
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   w גࣜձࣾίίϥϒϧ
 ιϑτ΢ΣΞΤϯδχΞ
   w ࠓ೔͸੢೔฻ཬSCʹࢀՃͯ͠·͕͢ɺ
 ࠓ΍ͬͯΔϓϩδΣΫτ͸1)1Ͱ͢ ࣗݾ঺հ
3. Crystal
 http://crystal-lang.org/
5. Rebuild.fm #98Ͱ΋ ͪΐͬͱ࿩୊ʹ͕͋ͬͯ·ͨ͠
6. RubyͬΆ͍Syntax
7. ͔֬ʹRubyͬΆ͍ # http://crystal-lang.org/ ʹࡌͬͯΔαϯϓϧίʔυ # A very basic HTTP server require "http/server" server = HTTP::Server.new(8080) do |request| HTTP::Response.ok "text/plain", "Hello world!" end puts "Listening on http://0.0.0.0:8080" server.listen
8. RubyͬΆ͍͚Ͳ όΠφϦʔʹίϯύΠϧͰ͖Δ
9. ʂ
10. GoΈ͍ͨʹΫϩείϯύΠϧ
 Ͱ͖Δͱເ޿͕Δײ͋Δ
11. http://crystal-lang.org/docs/syntax_and_semantics/cross-compilation.html
12. ΫϩείϯύΠϧ Ͱ͖ΔͬΆ͍ʂ
13. ΍ͬͯΈͨ
14. (ௐ͕ࠪ଍Γͳ͔ͬͨͷ͔) Ͱ͖ͳ͔ͬͨɻɻ
15. ΑΖ͍͠ ͳΒ͹Dockerͩ
16. ΍ͬͯΈͨ
17. ίʔυྫ(hello.cr) message = "hello #{ARGV[0]}" puts message puts 1 + 10 p [1, 2, 3] p ({a: 1, b: 2}) puts "hoge %s, %d, %.2f" % ["hogehoge", 1 , 1.12] [1, 2, 3, 4].each do |i| puts i end ([1,2,3] of Int32).each do |i| puts i end (1..10).each do |i| puts i end # ҎԼུ
18. DockerͰϏϧυ࣮ͯ͠ߦͯ͠ΈΔ # Macͷboot2docker؀ڥ͕લఏͰ͢ $ # Crystal͕ೖ͍ͬͯΔΠϝʔδͰ.crΛίϯύΠϧͯ͠/mntʹॻ͖ग़͢ $ docker run -it -v `pwd`:/mnt ariarijp/crystal crystal build -o /mnt/hello / mnt/hello.cr $ # Ϗϧυͨ͠όΠφϦʔΛCrystal͕ೖ͍ͬͯͳ͍Πϝʔδ্Ͱಈ͔͢ $ docker run -it -v `pwd`:/mnt ubuntu:14.04.2 /mnt/hello hoge hello hogehoge 11 [1, 2, 3] {:a => 1, :b => 2} hoge hogehoge, 1, 1.12 1 2 3 (ҎԼུ)
19. ΉΓ΍ΓΫϩείϯύΠϧ Ͱ͖ͳ͘΋ͳ͍ʂ
20. Go΋Rust΋ͦΕͧΕྑͦ͞͏͚ͩͲ (΄΅)RubyͷSyntaxͰॻ͚ΔͷͰ Rubyistʹ͸͍͍Μ͡Όͳ͍Ͱ͔͢ʁ
21. ͓·͚
22. Crystal͸͔ͳΓRubyͬΆ͍͚Ͳ ΍͸ΓRubyͰ͸ͳ͍
23. ྫɿhttp://openweathermap.org/ͷ API͔ΒఱؾΛJSONͰऔಘͯ͠දࣔ
24. ίʔυྫ(json_example.rb) require 'net/http' require 'json' HOST = 'api.openweathermap.org' PATH = '/data/2.5/weather?q=Shibuya' resp = Net::HTTP.get(HOST, PATH) weather = JSON.parse(resp) p weather['weather'][0]['main']
25. ίʔυྫ(json_example.cr) require "http/client" require "json" URL = "http://api.openweathermap.org/data/2.5/weather?q=Shibuya" resp = HTTP::Client.get(URL) weather = JSON.parse(resp.body) puts (((weather as Hash)["weather"] as Array)[0] as Hash)["main"] จࣈྻ͸μϒϧΫΥʔτ Cast! Cast! Cast! ஫ɿΩϟετͷͱ͜Ζ͸CrystalΛਖ਼͘͠ཧղ͍ͯ͠Ε͹͜Μͳ͜ͱͳ͍ͷ͔΋͠Ε·ͤΜ ඍົʹRubyͱҧ͏ඪ४ϥΠϒϥϦʔ
26. ຊ೔࢖ͬͨίʔυ https://github.com/ariarijp/ninirb-1st-anniversary-lt-crystal
27. Docker Hubʹ΋Πϝʔδஔ͖·ͨ͠ https://registry.hub.docker.com/u/ariarijp/crystal/