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
Parallel Socket Communication in Swift
s_shimotori
0
410
UIColor Anatomy
s_shimotori
1
2.1k
UIColor Cluster
s_shimotori
1
570
iOSDC Japan 2019 60 mins for color
s_shimotori
5
3.5k
wwdc19
s_shimotori
2
310
SE-0246 Generic Math(s) Functions
s_shimotori
2
2.3k
Introduction to Font and Typesetting
s_shimotori
4
3.6k
Swift Enumeration is so useful
s_shimotori
2
440
iosdcrc_operator
s_shimotori
1
600
Other Decks in Programming
See All in Programming
PHPはいつから死んでいるかの調査
chiroruxx
2
440
Tailwind CSSを本気でカスタマイズする方法
fsubal
15
5.6k
Criando a Woovi em uma semana
daniloab
0
110
Sheets API使ってみた
toshi0383
2
170
CDKコントリビュートの最初の壁を越えよう! -簡単issueの見つけ方-
badmintoncryer
3
380
Ruby Pattern Matching
bkuhlmann
0
940
Behind VS Code Extensions for JavaScript / TypeScript Linnting and Formatting
unvalley
6
1.3k
効率化に挑戦してみたらモバイル開発が少し快適になった話
ryunakayama
0
150
JavaScript Closure
asoluka
0
1.6k
Direct Style Effect Systems The Print[A] ExampleA Comprehension Aid
philipschwarz
PRO
0
360
GNU Makeの使い方 / How to use GNU Make
kaityo256
PRO
12
4.3k
Next.js App Router
quramy
13
2.2k
Featured
See All Featured
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
501
140k
Fashionably flexible responsive web design (full day workshop)
malarkey
398
65k
We Have a Design System, Now What?
morganepeng
43
6.8k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
323
20k
Optimising Largest Contentful Paint
csswizardry
13
2.4k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
242
1.2M
The Language of Interfaces
destraynor
151
23k
Producing Creativity
orderedlist
PRO
338
39k
A Modern Web Designer's Workflow
chriscoyier
689
190k
Git: the NoSQL Database
bkeepers
PRO
423
63k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
221
21k
Principles of Awesome APIs and How to Build Them.
keavy
121
16k
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