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Elmで関数型を意識する / Think functionally with Elm
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mather
June 26, 2018
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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
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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·ͨ͠