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
1.2k
Ruby で作る Ruby (物理)
mtsmfm
1
240
GraphQL Ruby benchmark
mtsmfm
1
870
タイムアウトにご用心 / Timeout might break application state
mtsmfm
6
2.6k
Build REST API with GraphQL Ruby
mtsmfm
0
360
GraphQL Ruby をちょっとだけ速くした / Make graphql-ruby faster a bit
mtsmfm
1
760
Gaming PC on GCP
mtsmfm
0
770
How to introduce GraphQL to an existing React-Redux application
mtsmfm
1
280
Canary release in StudySapuri
mtsmfm
0
3.2k
Other Decks in Programming
See All in Programming
インターン生でもAuth0で認証基盤刷新が出来るのか
taku271
0
150
Denoのセキュリティに関する仕組みの紹介 (toranoana.deno #23)
uki00a
0
230
実はマルチモーダルだった。ブラウザの組み込みAI🧠でWebの未来を感じてみよう #jsfes #gemini
n0bisuke2
3
1.4k
[AtCoder Conference 2025] LLMを使った業務AHCの上⼿な解き⽅
terryu16
6
1k
生成AI時代を勝ち抜くエンジニア組織マネジメント
coconala_engineer
0
39k
The Art of Re-Architecture - Droidcon India 2025
siddroid
0
160
re:Invent 2025 のイケてるサービスを紹介する
maroon1st
0
170
Honoを使ったリモートMCPサーバでAIツールとの連携を加速させる!
tosuri13
1
120
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
720
MDN Web Docs に日本語翻訳でコントリビュート
ohmori_yusuke
0
450
KIKI_MBSD Cybersecurity Challenges 2025
ikema
0
130
Unicodeどうしてる? PHPから見たUnicode対応と他言語での対応についてのお伺い
youkidearitai
PRO
0
490
Featured
See All Featured
Everyday Curiosity
cassininazir
0
120
The Curious Case for Waylosing
cassininazir
0
200
Navigating Weather and Climate Data
rabernat
0
69
From Legacy to Launchpad: Building Startup-Ready Communities
dugsong
0
120
Chasing Engaging Ingredients in Design
codingconduct
0
97
Principles of Awesome APIs and How to Build Them.
keavy
127
17k
Reality Check: Gamification 10 Years Later
codingconduct
0
2k
Digital Projects Gone Horribly Wrong (And the UX Pros Who Still Save the Day) - Dean Schuster
uxyall
0
120
What’s in a name? Adding method to the madness
productmarketing
PRO
24
3.9k
How To Stay Up To Date on Web Technology
chriscoyier
791
250k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
17k
Applied NLP in the Age of Generative AI
inesmontani
PRO
4
2k
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