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
Elmで関数型を意識する / Think functionally with Elm
Search
mather
June 26, 2018
Programming
0
410
Elmで関数型を意識する / Think functionally with Elm
ElmとVue.jsを比較しながら関数型言語によるエクササイズをおすすめする。
mather
June 26, 2018
Tweet
Share
More Decks by mather
See All by mather
SolidjsでLeacTion!を作り直しました / Rebuilt LeacTion! in Solid.js
mather
0
300
Webフレームワークの功罪 / Advantages and considerable point of Web Frameworks
mather
0
430
LeacTion!のアップデートとプチ勉強会へのいざない / Updates of LeacTion and Petit Meetup
mather
0
460
LeacTion!について / About LeacTion!
mather
0
320
Rubyでワンライナー / One-liner on Ruby
mather
0
450
認知と思考パターン / Cognition and Pattern
mather
1
270
「モデル」を考える / Think about "model"
mather
0
370
Shall we make a speech?
mather
0
230
Elmでライフゲーム / LifeGame in Elm
mather
1
1k
Other Decks in Programming
See All in Programming
GitHub Copilot for Azureを使い倒したい
ymd65536
1
310
The Implementations of Advanced LR Parser Algorithm
junk0612
2
1.3k
サービスレベルを管理してアジャイルを加速しよう!! / slm-accelerate-agility
tomoyakitaura
1
200
The New Developer Workflow: How AI Transforms Ideas into Code
danielsogl
0
110
個人開発の学生アプリが企業譲渡されるまで
akidon0000
2
1.2k
Boost Your Performance and Developer Productivity with Jakarta EE 11
ivargrimstad
0
760
AIコーディングエージェントを 「使いこなす」ための実践知と現在地 in ログラス / How to Use AI Coding Agent in Loglass
rkaga
4
1.2k
RubyKaigi Dev Meeting 2025
tenderlove
1
1.3k
20250429 - CNTUG Meetup #67 / DevOps Taiwan Meetup #69 - Deep Dive into Tetragon: Building Runtime Security and Observability with eBPF
tico88612
0
170
Laravel × Clean Architecture
bumptakayuki
PRO
0
130
note の Elasticsearch 更新系を支える技術
tchov
9
3.4k
fieldalignmentから見るGoの構造体
kuro_kurorrr
0
130
Featured
See All Featured
A Modern Web Designer's Workflow
chriscoyier
693
190k
Build The Right Thing And Hit Your Dates
maggiecrowley
35
2.7k
Statistics for Hackers
jakevdp
798
220k
The Invisible Side of Design
smashingmag
299
50k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
23
2.7k
Raft: Consensus for Rubyists
vanstee
137
6.9k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
The Art of Programming - Codeland 2020
erikaheidi
54
13k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
RailsConf 2023
tenderlove
30
1.1k
Git: the NoSQL Database
bkeepers
PRO
430
65k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
Transcript
ElmͰ ؔܕΛҙࣝ͢Δ 2018-06-26 ܂ാӳࢿ
ࣗݾհ • ܂ാӳࢿ(͘Θ͍͚ͨ͑͢) • גࣜձࣾΞϥλφ • Node.jsNuxt.jsͰπʔϧ࡞ͬͨΓ • ͖ͳݴޠScala, Haskell
• झຯɿμΠϏϯάɺυϩʔϯɺֶ
None
Elmͬͯͳʹʁ
http://elm-lang.org/
Elm • ؔܕϑϩϯτΤϯυݴޠ • ੩తܕ͚ • Elm Architecture • ֎෦JSͱͷΓऔΓՄೳ
example
ೖྗͱΧϯτΞοϓ • Elm൛ • https://ellie-app.com/BMTPN4b5kfa1 • Vue.js൛ʢόά͋Γʣ • https://codepen.io/anon/pen/PaBOWm
શମߏࣅ͍ͯΔ WJFX NPEFM VQEBUF )5.-5FNQMBUF EBUB NFUIPET Elm Vue.js ΞϓϦέʔγϣϯͷߏ্͍͍ͩͨಉ͡ʹͳΔ
ܕΛҙࣝ͢Δ type alias Model = { count : Int ,
incr : Int } initialModel : Model initialModel = { count = 0 , incr = 0 } data: { count: 0, incr: 0 } ҟͳΔܕͷΛೖྗͰ͖ͳ͍ɺଐੑΛՃͰ͖ͳ͍
ܕΛҙࣝ͢Δ — アクションを受けて — モデルを次の値に更新する関数 update : Msg -> Model
-> Model — 起こりうるアクションの型 type Msg = Increment | UpdateIncr String methods: { increment() { this.value += this.incr } } ΞΫγϣϯͷͱݱࡏͷϞσϧͷ͔Β ࣍ͷϞσϧͷঢ়ଶ͕Ұҙʹܾ·Δ
ܕΛҙࣝ͢Δ view : Model -> Html Msg view model =
div [] [ input [ onInput UpdateIncr ] [] , button [ onClick Increment ] [ text "増加" ] , div [] [text <| toString model.count] ] ModelҎ֎ͷঢ়ଶมແ͍
ࢀরಁաੑΛҙࣝ͢Δ • ೖྗͱग़ྗͷܕͰࢀরಁաੑΛҡ࣋ • ݱࡏ࣌ࠁऔಘͳͲ෭࡞༻ͷ͋Δؔ͋Δ • ಛผѻ͍͕ඞཁ • ίϯύΠϧ͕௨Εܕͷҧ͍ʹΑΔόά͕ແ ͍͜ͱ͕อূͰ͖Δ
Elmͷ͍ॴ • ܕΛ͖ͬͪΓҙࣝͯ͠όάͷͳ͍ΞϓϦέʔγϣ ϯΛ࡞Δͱ͖ • ୈҰڃؔͷѻ͍Λͬͱચ࿅͍ͤͨ͞ͱ͖ • JavaScriptͰͬͱ៉ྷͳίʔυΛॻͨ͘Ί • ϥϑͳͷ͍͍͚Ͳɺͨ·ʹυMʹͳΓ͍ͨͱ͖
ElmΦεεϝͰ͢ɻ
͋Γ͕ͱ͏͍͟͝·ͨ͠