BuckleScript 使ってみた

95d12ef3ae39f388be5a43b4788cb70e?s=47 Susisu
August 18, 2018

BuckleScript 使ってみた

95d12ef3ae39f388be5a43b4788cb70e?s=128

Susisu

August 18, 2018
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  1. 1.

    B u c k l e S c r i

    p t ࢖ ͬͯΈ ͨ 2 0 1 8 - 0 8 - 1 8 K y o t o . ͳ Μ ͔ # 4 i d : s u s i s u
  2. 2.

    i d : s u s i s u ‣

    ͸ͯͳ ΞϓϦέʔγϣϯ ΤϯδχΞ - Mackerel ‣ JavaScript, Scala, Haskell ‣ झຯ OCaml ྺ໿ 1 ೥
  3. 3.

    B u c k l e S c r i

    p t https://bucklescript.github.io
  4. 5.

    O C a m l ‣ ʮؔ਺ܕݴޠʯ - ܕ҆શ -

    ܕਪ࿦ (ຊདྷͷҙຯͰ) - record, variant, object, polymorphic variant, first class module, functor ‣ JavaScript ͱײ֮͸͍ۙ (ݸਓͷײ૝Ͱ͢)
  5. 6.

    B u c k l e S c r i

    p t Λ ࢖ ͏ Ϟ ν ϕ ʔ γ ϣ ϯ ‣ JavaScript ϥΠϒϥϦͷ࠶ઃܭͷػӡ - ͍ͭͰʹܕΛ༻͍ͨઃܭΛ͍ͨ͠ ‣ લ͔Βؾʹͳ͍ͬͯͨͷͰࢼ͍ͨ͠ - ର৅ͷϥΠϒϥϦͷґଘؔ܎͕গͳ͍ͷͰࢼ͠΍͍͢ - TypeScript ͳͲ͸ʮ΍Ε͹Ͱ͖Δʯ ‣ OCaml ͷڧྗͳݴޠػೳʹ৐͔ͬΓ͍ͨ
  6. 10.

    P ro s 1 . ܕ ҆ શ ‣ null

    / undefined ʹک͑Δඞཁ͸ͳ͍ let x = Some 2 let y = None let f = function | Some n -> n | None -> 0 (* default value *) var x = 2; var y = undefined; function f(param) { if (param !== undefined) { return param; } else { return 0; } }
  7. 12.

    P ro s 2 . ܕ ਪ ࿦ ‣ ܕ஫ऍ͸ଟ͘ͷ৔߹͸ॻ͔ͳͯ͘ྑ͍

    ‣ ࠷΋Ұൠతͳܕ (ओཁܕ) ͕ਪ࿦͞ΕΔ (* s: ('a -> 'b -> 'c) -> ('a -> 'b) -> 'a -> 'c *) let s x y z = x z (y z)
  8. 13.
  9. 14.

    P ro s 3 . J S ͱ ͷ ࿈

    ܞ ͕ ؆ ୯ ‣ JavaScript ͷόΠϯσΟϯά͸؆୯ʹͰ͖Δ external length: string -> int = "length" [@@bs.get] external substr: string -> int -> int -> string = "substr" [@@bs.send] let str = "ABCDE" let n = length str let sub = substr str 1 3 var str = "ABCDE"; var n = str.length; var sub = str.substr(1, 3);
  10. 16.

    P ro s 4 . ៉ ྷ ͳ ग़ ྗ

    ‣ ൺֱత៉ྷͳ JavaScript (ES5) ͕ग़ྗ͞ΕΔ let x = Some 2 let y = None let f = function | Some n -> n | None -> 0 var x = 2; var y = undefined; function f(param) { if (param !== undefined) { return param; } else { return 0; } }
  11. 17.

    P ro s 4 . ៉ ྷ ͳ ग़ ྗ

    ‣ ൺֱత៉ྷͳ JavaScript (ES5) ͕ग़ྗ͞ΕΔ let rec loop n = if n > 0 then begin Js.log n; loop (n - 1) end else () function loop(_n) { while(true) { var n = _n; if (n > 0) { console.log(n); _n = n - 1 | 0; continue ; } else { return /* () */0; } }; }
  12. 19.

    P ro s 5 . ί ϯύΠϧ ͕ ߴ ଎

    ‣ ΄΅ϑΝΠϧΛอଘͨ͠ॠؒʹίϯύΠϧ͕ऴΘΔ ‣ ެࣜυΩϡϝϯτʹΑΕ͹ 10,000 ϑΝΠϧͷڊେͳ ϓϩδΣΫτͰ 3 ෼ະຬ https://bucklescript.github.io/docs/en/build- performance
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  14. 21.

    P ro s 6 . ศ ར ͳ Ϗ ϧ

    υ γε ςϜ ‣ bsb ͱ͍͏ϏϧυγεςϜ͕෇ଐ ‣ watch ΋؆୯ʹͰ͖Δ ‣ ิ׬ͷͨΊͷϑΝΠϧͳͲ΋ࣗಈੜ੒ͯ͘͠ΕΔ
  15. 23.

    C o n s 1 . ໋ ໊ ن ଇ

    ͕ ࠞ ࡏ ‣ JavaScript ͸ camelCase ͕ओྲྀ ‣ OCaml ͸ snake_case ͕ओྲྀ ‣ BuckleScript ͷϥΠϒϥϦ͸ camelCase ͕ଟͦ͏?
  16. 25.

    C o n s 2 . จ ࣈ ྻ ‣

    ಺෦දݱͷҧ͍ - JavaScript ͷจࣈྻ͸ UTF-16 - OCaml ͷจࣈྻ͸όΠτྻ
  17. 26.

    C o n s 2 . จ ࣈ ྻ ‣

    ೔ຊޠͱ͔Λॻ͘ͱΊΜͲ͍͘͞ let wrong = "日本語" let ok = {js|日本語|js} (* j では変数の展開もできる *) let ok2 = {j|日本語|j} var wrong = "\xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e"; var ok = "日本語"; var ok2 = "日本語";
  18. 27.

    C o n s 2 . จ ࣈ ྻ ‣

    JS ༝དྷͷจࣈྻΛ OCaml ͷؔ਺ʹ౉͢ͱ... ‣ ଞʹ΋഑ྻ͕Մม௕ (JS) ͔ݻఆ௕ (OCaml) ͔ͳͲ΋ ͋Δ let str = {js|日本語|js} let char = String.get str 0 let () = Js.log char (* 26085 ... char として不正な値 *)
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