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
130
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
Perl Quiz
skaji
0
120
cpm at PerlCon 2019
skaji
0
110
Perl5 Package Manager
skaji
0
640
Internal of cpm
skaji
0
550
How to execute external programs in Perl
skaji
3
540
Writing Perl with w0rp/ale
skaji
0
2.2k
nginx unit
skaji
0
42
Perl6 ecosystem
skaji
1
1.3k
App::RemoteCommand 2018
skaji
0
20
Other Decks in Programming
See All in Programming
Architecture Decision Record (ADR)
nearme_tech
PRO
1
670
メモリ最適化を究める!iOSアプリ開発における5つの重要なポイント
yhirakawa333
0
410
Our Websites Need a Lifestyle Change, Not a Diet
ryantownsend
0
130
【TID2024】模擬講義:プログラマと一緒にゲームをデザインしてみよう!
akatsukigames_tech
0
580
RAGの回答精度評価用のQAデータセットを生成AIに作らせた話
kurahara
0
240
GoのIteratorに詳しくなってしまう
inatonix
1
200
ドメイン駆動設計を実践するために必要なもの
bikisuke
3
330
Regular Expressions, REXML, Automata Learning
makenowjust
0
210
Why Prism?
kddnewton
4
1.7k
Go1.23で入った errorsパッケージの小さなアプデ
kuro_kurorrr
2
330
rails_girls_is_my_gate_to_join_the_ruby_commuinty
maimux2x
0
190
connect-go で面倒くささと戦う / 2024-08-27 #newmo_layerx_go
izumin5210
2
630
Featured
See All Featured
Bootstrapping a Software Product
garrettdimon
PRO
304
110k
Six Lessons from altMBA
skipperchong
26
3.3k
Rebuilding a faster, lazier Slack
samanthasiow
78
8.6k
Optimising Largest Contentful Paint
csswizardry
30
2.8k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
230
17k
RailsConf 2023
tenderlove
28
800
Music & Morning Musume
bryan
46
6k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
43
2k
Why You Should Never Use an ORM
jnunemaker
PRO
53
8.9k
Visualization
eitanlees
142
15k
Keith and Marios Guide to Fast Websites
keithpitt
408
22k
Side Projects
sachag
451
42k
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