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
Pattern Matching
Search
Wojtek Mach
April 24, 2015
Programming
1
300
Pattern Matching
Wojtek Mach
April 24, 2015
Tweet
Share
More Decks by Wojtek Mach
See All by Wojtek Mach
Writing an Ecto Adapter: Introducing MyXQL
wojtekmach
1
140
Hex Core
wojtekmach
0
140
Recurrences & Intervals
wojtekmach
2
460
Building an Umbrella Project
wojtekmach
21
5.9k
Advanced OOP in Elixir
wojtekmach
6
640
OOP in Elixir
wojtekmach
4
300
Formatting ruby code
wojtekmach
0
120
Other Decks in Programming
See All in Programming
1から理解するWeb Push
dora1998
7
1.9k
Putting The Genie in the Bottle - A Crash Course on running LLMs on Android
iurysza
0
140
旅行プランAIエージェント開発の裏側
ippo012
2
900
もうちょっといいRubyプロファイラを作りたい (2025)
osyoyu
1
430
個人軟體時代
ethanhuang13
0
320
今から始めるClaude Code入門〜AIコーディングエージェントの歴史と導入〜
nokomoro3
0
130
@Environment(\.keyPath)那么好我不允许你们不知道! / atEnvironment keyPath is so good and you should know it!
lovee
0
120
Performance for Conversion! 分散トレーシングでボトルネックを 特定せよ
inetand
0
140
Navigating Dependency Injection with Metro
zacsweers
3
260
Android 16 × Jetpack Composeで縦書きテキストエディタを作ろう / Vertical Text Editor with Compose on Android 16
cc4966
1
200
MCPとデザインシステムに立脚したデザインと実装の融合
yukukotani
4
1.4k
AI時代のUIはどこへ行く?
yusukebe
18
8.8k
Featured
See All Featured
Reflections from 52 weeks, 52 projects
jeffersonlam
352
21k
GraphQLの誤解/rethinking-graphql
sonatard
72
11k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
9
810
How to Ace a Technical Interview
jacobian
279
23k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
188
55k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
31
2.2k
Designing Experiences People Love
moore
142
24k
Gamification - CAS2011
davidbonilla
81
5.4k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Why You Should Never Use an ORM
jnunemaker
PRO
59
9.5k
BBQ
matthewcrist
89
9.8k
Rebuilding a faster, lazier Slack
samanthasiow
83
9.2k
Transcript
Pattern Matching Wojtek Mach
Card „Ace of Spades”
Card "As" „Ace of Spades”
Card "A♠" „Ace of Spades”
Card { :A, :s } „Ace of Spades”
Card { rank, suit } „Ace of Spades”
Hand { {:A,:s}, {:A,:h}, {6,:s}, {6,:d}, {2,:c} } „Aces and
Sixes”
Ranks •Straight Flush •Four of a Kind •Full House •Flush
•Straight •Three of a Kind •Two Pairs •One Pair •High Card
Conditionals Card = Struct.new :rank, :suit def rank(hand) if hand[0].rank
== hand[1].rank && hand[0].rank == hand[2].rank && hand[0].rank == hand[3].rank :four_of_a_kind elsif hand[0].rank == hand[1].rank && hand[0].rank == hand[2].rank && hand[3].rank == hand[4].rank :full_house # ... end end
OOP! Card = Struct.new :rank, :suit class Hand def four_of_a_kind?
cards[0].rank == cards[1].rank && cards[0].rank == cards[2].rank && cards[0].rank == cards[3].rank end def full_house? # ... end # ... end
Pattern matching case value do pattern1 -> result1 pattern2 ->
result2 # ... end
Pattern matching case hand do { card1, card2, card3, card4,
card5 } -> rank1 { card1, card2, card3, card4, card5 } -> rank2 # ... end
Pattern matching case hand do { card1, card2, _ ,
_ , card5 } -> rank1 { card1, card2, _ , _ , card5 } -> rank2 # ... end
Pattern matching case hand do { {r1,s1}, {r2,s2}, _ ,
_ , {r5,s5} } -> rank1 { {r1,s1}, {r2,s2}, _ , _ , {r5,s5} } -> rank2 # ... end
Pattern matching case hand do { {a,_}, {a,_}, {a,_}, {a,_},
_ } -> :four_of_a_kind end
Pattern matching case hand do { {a,_}, {a,_}, {a,_}, {a,_},
_ } -> :four_of_a_kind { {a,_}, {a,_}, {a,_}, {b,_}, {b,_} } -> :full_house end
Pattern matching case hand do { {a,_}, {a,_}, {a,_}, {a,_},
_ } -> :four_of_a_kind { {a,_}, {a,_}, {a,_}, {b,_}, {b,_} } -> :full_house { {_,a}, {_,a}, {_,a}, {_,a}, {_,a} } -> :flush end
Pattern matching case hand do { {a,_}, {a,_}, {a,_}, {a,_},
_ } -> {:four_of_a_kind, a} { {a,_}, {a,_}, {a,_}, {b,_}, {b,_} } -> {:full_house, a, b} { {_,a}, {_,a}, {_,a}, {_,a}, {_,a} } -> {:flush} end
Pattern matching case hand do { {a,_}, {a,_}, {a,_}, {a,_},
_ } -> {:four_of_a_kind, a} { {a,_}, {a,_}, {a,_}, {b,_}, {b,_} } -> {:full_house, a, b} { {_,a}, {_,a}, {_,a}, {_,a}, {_,a} } -> {:flush} # straights are tricky! end
Thanks! @wojtekmach @wojtekmach