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
昔のGo, 今のGo ~比較, ソート編~
Search
Shoichi Kaji
May 17, 2024
Programming
0
260
昔のGo, 今のGo ~比較, ソート編~
kamakura.go #6, 2024-05-17
Shoichi Kaji
May 17, 2024
Tweet
Share
More Decks by Shoichi Kaji
See All by Shoichi Kaji
Parallel::Pipesの紹介
skaji
2
990
宿泊予約サイトにおける検索と料金計算の両立
skaji
2
4k
Perl Quiz
skaji
0
150
cpm at PerlCon 2019
skaji
0
130
Perl5 Package Manager
skaji
0
740
Internal of cpm
skaji
0
630
How to execute external programs in Perl
skaji
3
690
Writing Perl with w0rp/ale
skaji
0
2.3k
nginx unit
skaji
0
52
Other Decks in Programming
See All in Programming
Cursorハンズオン実践!
eltociear
2
1.2k
チームの境界をブチ抜いていけ
tokai235
0
230
Devvox Belgium - Agentic AI Patterns
kdubois
1
150
Android16 Migration Stories ~Building a Pattern for Android OS upgrades~
reoandroider
0
140
What Spring Developers Should Know About Jakarta EE
ivargrimstad
0
510
テーブル定義書の構造化抽出して、生成AIでDWH分析を試してみた / devio2025tokyo
kasacchiful
0
310
Webサーバーサイド言語としてのRustについて
kouyuume
1
4.9k
AI駆動で0→1をやって見えた光と伸びしろ
passion0102
1
860
Foundation Modelsを実装日本語学習アプリを作ってみた!
hypebeans
0
130
Developer Joy - The New Paradigm
hollycummins
1
370
組込みだけじゃない!TinyGo で始める無料クラウド開発入門
otakakot
2
380
Catch Up: Go Style Guide Update
andpad
0
260
Featured
See All Featured
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
234
17k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
27k
StorybookのUI Testing Handbookを読んだ
zakiyama
31
6.2k
It's Worth the Effort
3n
187
28k
jQuery: Nuts, Bolts and Bling
dougneiner
65
7.9k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
34
2.3k
Documentation Writing (for coders)
carmenintech
75
5.1k
Learning to Love Humans: Emotional Interface Design
aarron
274
41k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
23
1.5k
Testing 201, or: Great Expectations
jmmastey
45
7.7k
Automating Front-end Workflow
addyosmani
1371
200k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
10
890
Transcript
ੲͷGo, ࠓͷGo ~ ൺֱ, ιʔτฤ ~ Shoichi Kaji
ൺֱ, ιʔτؔ࿈ͷมߋ • go1.18 generics • go1.20 time.Compare • go1.21
slices package, cmp package • go1.22 cmp.Or
time.Compare • time.Timeʹ࣌ࠁ͕"લ"͔൱͔Λฦ͢Beforeϝιου͕͋Δ: func (t Time) Before(t2 Time) bool •
go1.20ͰCompareϝιου͕Ճ͞Εͨ: func (t Time) Compare(t2 Time) int • t͕t2ΑΓ"લ"ͳΒ: -1 t͕t2ͱ"͍͠"ͳΒ: 0 t͕t2ΑΓ"ޙΖ"ͳΒ: +1
time.Compare • ࠓ·Ͱt͕t2 "Ҏલ"Λ͍ࣔͨ͠ͱ͖ t.Before(t2) || t.Equal(t2) ͋ ͱॻ͔ͳ͚Ε͍͚ͳ͔ͬͨͱ͜Ζ t.Compare(t2)
<= 0 ͋ ͱॻ͚ΔΑ͏ʹͳͬͨ 👍
slices.Sort/SortFunc • sort packageʹSlice,Sort͕ؔఆٛ͞Ε͍ͯΔ: func Slice(x any, less func(i, j
int) bool) func Sort(x Interface) • εϥΠεͷιʔτ্هͷͲͪΒ͔Λ͏ͷ͕Ұൠతͩͬͨ • Slice: εϥΠεΛanyͰड͚औ͍ͬͯΔ 🥲 • Sort: sort.InterfaceΛຬͨ͢ɺLen, Less, Swapϝιου Λ࣮ͨ͠ܕΛΘ͟Θ͟࡞Βͳ͍ͱ͍͚ͳ͍ 🥲
slices.Sort/SortFunc • go1.21Ͱೖͬͨslices packageʹgenericsΛͬͨε ϥΠεͷιʔτ͕ؔఆٛ͞Ε͍ͯΔ func Sort[S ~[]E, E cmp.Ordered](x
S) func SortFunc[S ~[]E, E any](x S, compare func(a, b E) int) • ܕ͕͍ͭͨঢ়ଶͰεϥΠεΛड͚औΔ 😊 • ιʔτ݅Λࣔ͢Ҿͷ͕ؔɺless͔ΒcompareʹมΘ͍ͬͯΔ ͜ͱʹ͍ͨ͠ • ࠓޙsort.Sort/SliceͰͳͪ͘͜ΒΛ͏ͱΑͦ͞͏
ෳͷιʔτ݅ • ෳͷιʔτ݅compare1,2,3ΛΈ߹Θͤෳࡶ ͳιʔτ݅Λॻ͘͜ͱ͕͋Δ: • compare := func(e1, e2 E)
int { if c := compare1(e1, e2); c != 0 { return c } if c := compare2(e1, e2); c != 0 { return c } return compare3(e1, e2) }
ෳͷιʔτ݅ • go1.21Ͱcmp.Or͕ಋೖ͞Εͨɻ͜ΕෳͷҾΛड͚औΓɺड͚औͬͨҾ ͷதͰ࠷ॳʹzeroͰͳ͔ͬͨҾΛฦؔ͢Ͱ͋Δɻ • ͜ΕΛ͏ͱઌ΄Ͳͷcompare؆ܿʹॻ͚Δ 👍 • ͨͩ͠cmp.OrͪΖΜབྷతͰͳ͍ɻ ͕ͦ͜ॏཁͳͱ͖Ҏલͷॻ͖ํΛ͖͢ɻ
compare := func(e1, e2 E) int { return cmp.Or( compare1(e1, e2), compare2(e1, e2), compare3(e1, e2), ) }
·ͱΊ • time.Compare͕ಋೖ͞ΕͨΓɺslices.SortFunc͕CompareΛ ཁٻ͍ͯ͠Δ͜ͱΛݟΔʹɺ "ൺֱ"ϝιου/ؔCompare͕ελϯμʔυʹͳ͍͖ͬͯͦ ͏ɻࣗͰ࡞ͬͨܕʹൺֱϝιουΛੜ͍ͨ͠ͱ͖ɺ Compare(e2 E) intΛ༻ҙ͢ΔͱΑͦ͞͏ɻ •
sort.Sort/SlicesͰͳ͘ɺslices.Sort/SortFuncΛ͏ͱΑ͍ɻ • ෳͷιʔτ݅cmp.OrΛͬͯ؆ܿʹॻ͚ΔΑ͏ʹͳͬ ͨɻ