Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Learn ruby with doukaku
Search
Fumiaki MATSUSHIMA
April 28, 2016
Programming
2
2k
Learn ruby with doukaku
西日暮里.rb ゴールデンだよLT大会 @ 秋葉原UDX!!
Fumiaki MATSUSHIMA
April 28, 2016
Tweet
Share
More Decks by Fumiaki MATSUSHIMA
See All by Fumiaki MATSUSHIMA
Learning from performance improvements on GraphQL Ruby
mtsmfm
1
1.1k
Ruby で作る Ruby (物理)
mtsmfm
1
190
GraphQL Ruby benchmark
mtsmfm
1
770
タイムアウトにご用心 / Timeout might break application state
mtsmfm
6
2.5k
Build REST API with GraphQL Ruby
mtsmfm
0
300
GraphQL Ruby をちょっとだけ速くした / Make graphql-ruby faster a bit
mtsmfm
1
700
Gaming PC on GCP
mtsmfm
0
710
How to introduce GraphQL to an existing React-Redux application
mtsmfm
1
230
Canary release in StudySapuri
mtsmfm
0
3k
Other Decks in Programming
See All in Programming
クリーンアーキテクチャから見る依存の向きの大切さ
shimabox
5
1.1k
クックパッド検索システム統合/Cookpad Search System Consolidation
giga811
0
130
Kotlinの開発でも AIをいい感じに使いたい / Making the Most of AI in Kotlin Development
kohii00
5
1.8k
Visual StudioのGitHub Copilotでいろいろやってみる
tomokusaba
1
220
Learning Kotlin with detekt
inouehi
1
190
pylint custom ruleで始めるレビュー自動化
shogoujiie
0
160
たのしいSocketのしくみ / Socket Under a Microscope
coe401_
8
1.4k
もう少しテストを書きたいんじゃ〜 #phpstudy
o0h
PRO
20
4.3k
DevNexus - Create AI Infused Java Apps with LangChain4j
kdubois
0
130
GoとPHPのインターフェイスの違い
shimabox
2
210
PEPCは何を変えようとしていたのか
ken7253
3
300
苦しいTiDBへの移行を乗り越えて快適な運用を目指す
leveragestech
0
1.2k
Featured
See All Featured
Why You Should Never Use an ORM
jnunemaker
PRO
55
9.2k
Visualization
eitanlees
146
15k
Raft: Consensus for Rubyists
vanstee
137
6.8k
BBQ
matthewcrist
87
9.5k
YesSQL, Process and Tooling at Scale
rocio
172
14k
Producing Creativity
orderedlist
PRO
344
40k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
356
29k
No one is an island. Learnings from fostering a developers community.
thoeni
21
3.2k
Why Our Code Smells
bkeepers
PRO
336
57k
How to train your dragon (web standard)
notwaldorf
91
5.9k
VelocityConf: Rendering Performance Case Studies
addyosmani
328
24k
Stop Working from a Prison Cell
hatefulcrawdad
268
20k
Transcript
(株)永和システムマネジメント @mtsmfm 松島 史秋 どう書くで学ぶ Ruby
松島 史秋 GitHub, Twitter, Nintendo ID @mtsmfm
None
どう書く
https://yhpg.doorkeeper.jp/
http://nabetani.sakura.ne.jp/hena/orde03nofconv/
多角形の頂点のうち、 内角が180度より小さいも のの数を計算する プログラムを書け。
スタート!!!
...
1時間後
Emoji provided free by Emoji One
Emoji provided free by Emoji One
できても できなくても 発表
Emoji provided free by Emoji One
おもしろい!
None
1時間という枠
素振り重要 Photo by cambodia4kidsorg
文字列操作
どう書くの 入力は 文字列
/*0*/ test( "1a2t3s2s", "11" ); /*1*/ test( "1a1c1d00", "22" );
/*2*/ test( "00", "20" ); /*3*/ test( "3q", "6" ); /*4*/ test( "3t2a", "8" ); /*5*/ test( "3t3a", "8" ); /*6*/ test( "3t4a", "12" ); /*7*/ test( "004q2g", "32" ); /*8*/ test( "4c2g2k4i", "24" ); /*9*/ test( "1o1a4f4i1t", "26" ); /*10*/ test( "4t3a4g2a2o2p", "24" ); /*11*/ test( "4i4o3i3c3n3h2c", "30" ); /*12*/ test( "4m3n3m002b1b3a", "34" ); /*13*/ test( "001b2a3t4s3s2s1s", "27" ); /*14*/ test( "1n1j3o4o1h2n2r1k", "36" ); /*15*/ test( "4o2a2j1m2e4l2l3m3o", "42" );
String#scan '1a2t3s2s'.scan(/\d\w/) #=> ["1a", "2t", "3s", "2s"]
String#chars
String#ord Integer#chr ?a.ord #=> 97 97.chr #=> "a"
配列操作
Array#zip Array#rotate
Array#combination a = [1, 2, 3, 4] a.combination(1).to_a => [[1],[2],[3],[4]]
a.combination(2).to_a => [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]] a.combination(3).to_a => [[1,2,3],[1,2,4],[1,3,4],[2,3,4]] a.combination(4).to_a => [[1,2,3,4]]
Array#transpose [ [1,2], [3,4], [5,6] ].transpose => [[1, 3, 5],
[2, 4, 6]]
Enumerable#each_slice Enumerable#each_cons
&.
Ruby 組込みだけで 超便利!
便利 gem
gem 'activesupport', require: 'active_support/all'
あれ? AS だっけ? 標準だっけ?
Emoji provided free by Emoji One
gem 'pry-rescue'
例外上がった ところで 止まる
Bundler
require 'bundler/inline' gemfile do source 'https://rubygems.org' gem 'activesupport', require: 'active_support/all'
end
結果の共有に 便利
フィードバック
'1a2t3s2s'.scan(/\d\w/) #=> ["1a", "2t", "3s", "2s"]
'1a2t3s2s'.scan(/../) #=> ["1a", "2t", "3s", "2s"]
'1a2t3s2s'.scan(/../) #=> ["1a", "2t", "3s", "2s"] Emoji provided free by
Emoji One
別言語で解く
Ruby の表現力
“Rubyをキメると 気持ちいい” - matz