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
RecordDotSyntaxのあれこれ
Search
lotz
December 11, 2019
Programming
2
850
RecordDotSyntaxのあれこれ
lotz
December 11, 2019
Tweet
Share
More Decks by lotz
See All by lotz
Recursion Schemesで考える並べ替えアルゴリズム
lotz84
6
1.7k
関数と型で理解する自動微分
lotz84
6
2.6k
Other Decks in Programming
See All in Programming
"config" ってなんだ? / What is "config"?
okashoi
0
210
Hanami and htmx
bkuhlmann
0
190
What We Can Learn From OSS
inouehi
0
400
PostmanでAPIの動作確認が楽になった話
h455h1
0
120
せっかくモデル図描くのなら、嬉しいことが多い方がいいよね!
kuboaki
1
3.1k
Rubyでたのしむクリエイティブコーディング/Enjoy Creative coding with Ruby
chobishiba
1
160
大規模Reactアプリのリアーキテクチャ~8万行のTanStack Query移行の軌跡~
kj455
3
720
Prepare for Jakarta EE 11 - Performance and Developer Productivity
ivargrimstad
0
430
try!Swift Tokyo 2024 参加報告 LT
akidon0000
1
190
[技育CAMPアカデミア]アイディアを形に!【超入門】スマホアプリ開発〜リリースまでの流れをご紹介
teamlab
PRO
0
340
Java 22 Overview
kishida
1
170
StoreKit2によるiOSのアプリ内課金のリニューアル
kangnux
0
100
Featured
See All Featured
How to Ace a Technical Interview
jacobian
272
22k
A Modern Web Designer's Workflow
chriscoyier
688
190k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
220
21k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
13
1.5k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
9
8.3k
Build your cross-platform service in a week with App Engine
jlugia
225
17k
Faster Mobile Websites
deanohume
297
30k
Scaling GitHub
holman
457
140k
Build The Right Thing And Hit Your Dates
maggiecrowley
23
2k
Why You Should Never Use an ORM
jnunemaker
PRO
50
8.6k
jQuery: Nuts, Bolts and Bling
dougneiner
59
7.1k
What’s in a name? Adding method to the madness
productmarketing
PRO
15
2.6k
Transcript
Record Dot Syntax ͷ͋Ε͜Ε By lotz 2019/12/11 ୈ2ճGHCษڧձ @ IIJ-II
RecordDotSyntax https://github.com/shayne-fletcher-da/ghc-proposals/blob/record-dot-syntax/proposals/0000-record-dot-syntax.md#motivation
RecordDotSyntaxͷجຊ https://github.com/shayne-fletcher-da/ghc-proposals/blob/record-dot-syntax/proposals/0000-record-dot-syntax.md#recorddotsyntax-language-extension
RecordDotSyntaxͷੜߏจ https://github.com/shayne-fletcher-da/ghc-proposals/blob/record-dot-syntax/proposals/0000-record-dot-syntax.md#recorddotsyntax-language-extension
Recordվળͷ্ʹ͋Δ ()$֦ு1SPQPTBM ()$7FSTJPO %VQMJDBUF3FDPSE'JFMET 0WFSMPBEFE-BCFMT 0WFSMPBEFE3FDPSE'JFMET "EETFU'JFMEUP)BT'JFME
/P'JFME4FMFDUPST "DDFQUFE 3FDPSE%PU4ZOUBY /&8
DAMLͰͷ࣮͋Γ • DAMLHaskell/ScalaͰ։ൃ͞Ε͍ͯΔɺ εϚʔτίϯτϥΫτهड़ݴޠ • DAMLͷ։ൃʹ͓͍ͯGHC Pluginsͱ͍͏ܗͰ RecordDotSyntaxͱ΄΅ಉ͡ػೳ͕ΘΕ͍ͯΔ
ఏҊͯ͠ΔͷDAMLͷਓ https://github.com/ghc-proposals/ghc-proposals/pull/282
PRͷԠ https://github.com/ghc-proposals/ghc-proposals/pull/282#issuecomment-540968106 *TUSPOHMZTVQQPSUUIFEJSFDUJPOPG USBWFMPGUIJTQSPQPTBM
PRͷԠ 5IFMPTTPGQPMZNPSQIJDVQEBUFJT BIVHFQSPCMFN JNP https://github.com/ghc-proposals/ghc-proposals/pull/282#issuecomment-541111003
PRͷԠ 5IJTQSPQPTBMJTGVMMPGVUUFSOPOTFOTF https://github.com/ghc-proposals/ghc-proposals/pull/282#issuecomment-541460439
> :t (.age) (.age) :: Person -> Int > :t
(. age) (. age) :: (Int -> c) -> Person -> c ۭനͷ༗Γແ͠Ͱ͜͜·Ͱҙຯ͕มΘΔͷ ॳ৺ऀʹ͘͠ͳ͍ʁ
ࠓͷεςʔλε https://github.com/ghc-proposals/ghc-proposals/pull/282#issuecomment-559259994 8JUIUIFUIDPNNFOU BGUFSSFBDUJPOTPOUIFJOJUJBM QPTU QBSUJDJQBOUTBOEBUMFBTUQPMMTPGVTFSTFOUJNFOU *EMJLFUPUVSOUIJTPWFSUPUIFDPNNJUUFF
ະղܾ https://twitter.com/ndm_haskell/status/1190680324495302658
͋Ε͜Ε
f a.b.c x ͷύʔε f a.foo.bar.baz.quux 12 f (a.foo.bar.baz.quux)
12 ͱධՁ͞ΕΔ ((f a).foo.bar.baz.quux) 12Ͱͳ͍ https://github.com/shayne-fletcher-da/ghc-proposals/blob/record-dot-syntax/proposals/0000-record-dot-syntax.md#record-selection
Lensʁ • f $ record ^. field ͕ f record.field
ͱॻ͚Δ • Lensෳࡶա͗Δ… • Lensͱ໊લۭ͕ؒҟͳΔͷͰҰॹʹ͑Δ https://github.com/shayne-fletcher-da/ghc-proposals/blob/record-dot-syntax/proposals/0000-record-dot-syntax.md#alternatives-to-this-proposal
͜͏͍͏දهແ͍ • ߋ৽ʹؔ͢Δߏจ • a{field * 2} • a{field <-
(*2)} • a{field * = 2} • ߋ৽ʹؔ͢ΔηΫγϣϯ • ({a=}) • ({a=b}) • (.lbl=) https://github.com/shayne-fletcher-da/ghc-proposals/blob/record-dot-syntax/proposals/0000-record-dot-syntax.md#alternatives-within-this-proposal
Ҏ্