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
250
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
120
Perl5 Package Manager
skaji
0
740
Internal of cpm
skaji
0
630
How to execute external programs in Perl
skaji
3
680
Writing Perl with w0rp/ale
skaji
0
2.3k
nginx unit
skaji
0
52
Other Decks in Programming
See All in Programming
(Extension DC 2025) Actor境界を越える技術
teamhimeh
1
220
AIで開発生産性を上げる個人とチームの取り組み
taniigo
0
130
あなたの知らない「動画広告」の世界 - iOSDC Japan 2025
ukitaka
0
390
『毎日の移動』を支えるGoバックエンド内製開発
yutautsugi
2
190
プロダクト開発をAI 1stに変革する〜SaaS is dead時代で生き残るために〜 / AI 1st Product Development
kobakei
0
490
2分台で1500examples完走!爆速CIを支える環境構築術 - Kaigi on Rails 2025
falcon8823
3
3.3k
CSC509 Lecture 02
javiergs
PRO
0
410
Catch Up: Go Style Guide Update
andpad
0
180
高度なUI/UXこそHotwireで作ろう Kaigi on Rails 2025
naofumi
4
3.5k
いま中途半端なSwift 6対応をするより、Default ActorやApproachable Concurrencyを有効にしてからでいいんじゃない?
yimajo
2
340
アメ車でサンノゼを走ってきたよ!
s_shimotori
0
140
止められない医療アプリ、そっと Swift 6 へ
medley
1
120
Featured
See All Featured
Measuring & Analyzing Core Web Vitals
bluesmoon
9
610
Optimizing for Happiness
mojombo
379
70k
Documentation Writing (for coders)
carmenintech
75
5k
The Cost Of JavaScript in 2023
addyosmani
53
9k
A Tale of Four Properties
chriscoyier
160
23k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
2.6k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
The Language of Interfaces
destraynor
162
25k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
162
15k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
Building Better People: How to give real-time feedback that sticks.
wjessup
368
20k
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