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
Equatable, Comparable and Hashable
Search
Shigure Shimotori
August 08, 2017
Programming
0
1.4k
Equatable, Comparable and Hashable
Shigure Shimotori
August 08, 2017
Tweet
Share
More Decks by Shigure Shimotori
See All by Shigure Shimotori
Synchronizationを支える技術
s_shimotori
1
200
1人で挑むSwiftコンパイラ 〜型システム入門編〜
s_shimotori
0
740
英語
s_shimotori
1
660
Parallel Socket Communication in Swift
s_shimotori
1
730
UIColor Anatomy
s_shimotori
1
2.4k
UIColor Cluster
s_shimotori
1
730
iOSDC Japan 2019 60 mins for color
s_shimotori
5
3.8k
wwdc19
s_shimotori
2
360
SE-0246 Generic Math(s) Functions
s_shimotori
2
2.5k
Other Decks in Programming
See All in Programming
SwiftUI移行のためのインプレッショントラッキング基盤の構築
kokihirokawa
0
170
Django NinjaによるAPI開発の効率化とリプレースの実践
kashewnuts
1
290
PEPCは何を変えようとしていたのか
ken7253
3
300
⚪⚪の⚪⚪をSwiftUIで再現す る
u503
0
100
Honoのおもしろいミドルウェアをみてみよう
yusukebe
1
240
Boost Performance and Developer Productivity with Jakarta EE 11
ivargrimstad
0
1.1k
コミュニティ駆動 AWS CDK ライブラリ「Open Constructs Library」 / community-cdk-library
gotok365
2
260
Swift Testingのモチベを上げたい
stoticdev
2
190
Generating OpenAPI schema from serializers throughout the Rails stack - Kyobashi.rb #5
envek
1
420
コードを読んで理解するko build
bells17
1
110
DRFを少しずつ オニオンアーキテクチャに寄せていく DjangoCongress JP 2025
nealle
2
290
SwiftUI Viewの責務分離
elmetal
PRO
2
280
Featured
See All Featured
Visualization
eitanlees
146
15k
Building Your Own Lightsaber
phodgson
104
6.2k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Why Our Code Smells
bkeepers
PRO
336
57k
The Straight Up "How To Draw Better" Workshop
denniskardys
232
140k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
100
18k
Intergalactic Javascript Robots from Outer Space
tanoku
270
27k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
How GitHub (no longer) Works
holman
314
140k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
4
440
The MySQL Ecosystem @ GitHub 2015
samlambert
250
12k
Rebuilding a faster, lazier Slack
samanthasiow
80
8.9k
Transcript
Equatable / Comparable / Hashable Λશʹཧղ͢Δ @S_Shimotori Otemachi.swift x Kyobashi.swift
#01
ͩΕ • @S_Shimotori·ͨ@S_Shimotori_pub • ֶੜ • DroidKaigi2016-2018ӡӦϝϯόʔ
iOSDCʹొஃ͠·͢ • #1349ʮARC vs. GCʁARC in GCʁʯ • 5ͰGCͷΛ͠·͢ •
ݫ͍͠ • Reject͞Εͨͭదʹڙཆ͢ΔͭΓ • ςετ • ԋࢉࢠ • Ͳ͜Ͱʁ
Equatable Comparable Hashable
͓͞Β͍ • Equatable • ͍͔͠Ͳ͏͔ൺֱͰ͖Δ • Comparable • ؔԋࢉࢠͰൺֱͰ͖Δ •
͍͍ͪͪൺֱ༻ͷؔΛ༻ҙ͠ͳͯ͘ιʔτͰ͖Δ • Hashable • ϋογϡΛ࡞ΕΔ • Map/DictionaryͷΩʔʹͳΕΔ • JavaComparableͷΈinterfaceͰΓclass Objectʹੜ͑ͯΔ • Pythonduck typing
SwiftͰ:
EquatableͱΏ͔͍ͳؒͨͪ(Ұ෦লུ) &RVBUBCMF $PNQBSBCMF )BTIBCMF /VNFSJD 4FU"MHFCSB 4USJEFBCMF 4USJOH1SPUPDPM 3FGFSFODF$POWFSUJCMF Foundationͷࢀরܕଓ͘ɻ
String͕ଓ͘ɻ 1࣍ݩͷ࿈ଓతͳɻ UnsafePointer͕ଓ͘ɻ ೋ߲ࢉज़ԋࢉɻ Set͕ଓ͘ɻ • ͬͱਓؾͳProtocolͷ1ͭ • ͳʹΑΓଘࡏײ͕େ͖͍ɺେ͖͗͢Δ • Equatable.swiftʹͪΌ͔ͬΓಉҰఆͷ࣮͍Δ
protocol Equatable
ͱΓ͋͑ͣ == Λ࣮͢ΕOKʂ ❌
protocol Equatableͷཁ݅ • ସՄೳੑ • ࣹੑ • ରশੑ • ਪҠੑ
• a == b ͕ਅͳΒ not a != b ͕ਅ • ͜ͷ͏ͪEquatable͔ΒϑΥϩʔ͕ೖΔͷ࠷ޙ͚ͩʂ • ҙਤతʹΦʔόʔϥΠυ͠ͳ͍ݶΓ==ͷٯͷ݁ՌΛฦ͢
Optional<T>ͱEquatableͷؔ • OptionalEquatableͰͳ͍ • Ͱis Equatableͷ݁Ռதʹґଘ͢Δ • ͰผͰԋࢉࢠ͕࣮͞Ε͍ͯΔͷͰnilͱͷൺֱՄೳ
protocol Comparable
దʹ < Λ࣮͓͚ͯ͠ ͳΜͱ͔ͳΔͭ ❌
protocol Comparableͷׂͱཁ݅ • ܕʹࣗવॱং͚Λ༩͑Δ • σϑΥϧτͷιʔτํ๏ΛܾΊΔͱ͍͏͜ͱ • SwiftؔԋࢉࢠͰදݱ͍ͯ͠ΔͷͰEquatable͕ඞਢ • ࡶʹ࣮͠ͳ͍ݶΓEquatableͱໃ६͠ͳ͍
• ࡶʹ࣮͠ͳ͍ݶΓ < = > ͷͲΕ͔1͚͕ͭͩtrueʹͳΔ • strict total orderingͱݺΕΔੑ࣭Λຬͨ͞ͳ͚ΕͳΒͳ͍ • ʮ͖ͬͪΓϧʔϧΛܾΊͯશһҰྻʹฒͳ͍ͱͩΊʯ • ුಈখͳͲͰྫ֎͕ೝΊΒΕΔ߹͕͋Δ
sort2छྨ • Ҿͳ͠ͷsort / sorted • ࣗવॱং͚ʹैͬͯιʔτ͢Δ • ͭ·Γཁૉ͕ComparableͰͳ͚ΕͳΒͳ͍ •
ҾΛऔΔsort / sorted • ରίϨΫγϣϯͷΈͰ௨༻͢Δॱং͚Ͱιʔτ͢Δ • ཁૉ͕ComparableͰͳ͍͍ͯ͘ • strict weak orderingͳॱং͚͕ڐ͞ΕΔ • Comparableͱͷҧ͍ൺֱෆೳ͕ڐ͞ΕΔ͜ͱ • ͲͪΒ࠷ޙॱং͚ʹैͬͯΠϯτϩιʔτ͞ΕΔ
protocol Hashable
ͱΓ͋͑ͣ ϋογϡΛग़͓͚ͯ͠OKʂ ❌
protocol Hashable • ϋογϡΛ࣮͢Δͱ͖ͷΑ͋͘Δҙ • ޓ͍ʹಉͳΒϋογϡ͘͠ͳ͚ΕͳΒͳ͍ • ٯཱ͠ͳͯ͘Α͔ͬͨΓ͢Δ • SwiftͰEquatableඞਢͳͷͰ࣮ΛΕΔ͜ͱͳ͍ͣ
• ϧʔϧʹଇͬͯͪΌΜͱ࣮͢Δ͜ͱʂ
Ҏ্ʂ
͓·͚
assertEqual
assertEqualʹݴޠͷݸੑ͕ग़Δ • Javaʹࢀরܕ༻ͱϓϦϛςΟϒܕ༻͕ͦΕͧΕ༻ҙ͞Ε͍ͯΔ • Pythonʹ1छྨ͔͠ͳ͍ • Objective-CΦϒδΣΫτ༻ͱεΧϥ༻͕༻ҙ͞Ε͍ͯΔ • SwiftNonNull༻ͱNullable༻͕༻ҙ͞Ε͍ͯΔ •
ࢀরܕͱܕͰͷ۠ผͰͳ͍ • ͜ͷ2ͭ΄ͱΜͲҧ͍͕ͳ͍ɺ࣮࣭1छྨɻ
·ͱΊ
·ͱΊ • Equatable / Comparable / Hashableʹϧʔϧ͕͋Δ • ޓ͍ͷؔੑprotocolͷܧঝͰදݱ͞Ε͍ͯΔ͕ɺ ϧʔϧʹଇ͍ͬͯΔ͔Ͳ͏͔ݟͯ͘Εͳ͍
ਖ਼࣮͘͠͠·͠ΐ͏ʂ ཧΛݴ͑ͦͷςετཉ͘͠ͳ͍ʁ