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elmから学ぼう
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mather
April 04, 2016
Programming
1
250
elmから学ぼう
関数型リアクティブなフロントエンド言語であるelmの紹介
mather
April 04, 2016
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Transcript
elm͔Βֶ΅͏ 2016/04/02 ܂ാ ӳࢿ #satoimo
ࣗݾհ • ܂ാ ӳࢿ (32) • גࣜձࣾΞϥλφ • ීஈόοΫΤϯυͬͯ·͢ •
Scalaͱ͔Haskellͱ͔ • ΧϝϥͱεΩϡʔόμΠϏϯά͕झຯ
ࠓͷ༰ • elmͷհ • σϞ • ؔܕͱϦΞΫςΟϒ • ·ͱΊ
elm
elm • http://elm-lang.org/ • ·ͩൃల్্(ݱࡏver. 0.16.0)ͳݴޠ • ؔܕϦΞΫςΟϒͳϑϩϯτΤϯυݴޠ • HTML,
JavaScript(, CSS)Λੜ͢Δ • HaskellϥΠΫͳهड़͕Ͱ͖Δ
લஔ͖ • elm·࣮ͩ༻తͳஈ֊Ͱ͋Γ·ͤΜ • elm͕͑ͳͯ͘ྑ͍Ͱ͢ • Τοηϯε͚ͩͳΜͱͳ͘Θ͔ͬͯ͘ΕΔͱ͋ Γ͕͍ͨͰ͢(^_^ʎ
σϞ
TodoMVC (ެࣜσϞ)
ྃͨ͠λεΫΛআ ະྃͷλεΫ ͲͷλεΫ͕ݟΕΔঢ়ଶ͔ʁ λεΫ ྃͨ͠ʁ λεΫϦετ
ؔܕͱϦΞΫςΟϒ
ঢ়ଶͷͱෳࡶ͞ • ཧ͢Δঢ়ଶͷ͕ଟ͍ˠෳࡶʹͳΔ • ϑϥάͷཧɺදࣔ༻ͷɺetc… • ࣮ࡍʹผͷঢ়ଶʹґଘ͍ͯ͠Δ͜ͱ • ґଘ͍ͯ͠Δͣͷঢ়ଶ͕ಉظ࿙Εˠόά •
ෳͷঢ়ଶΛಉظ͢ΔͨΊͷίʔυ͕૿͑Δ
ґଘ͍ͯ͠Δͣͷঢ়ଶ var str = “hoge”; var len = str.length; var
str = “fugafuga”; if (str.length === len) { // 正常 } else { // 例外処理!? }
ཧ͢Δঢ়ଶΛ࠷খݶʹ͢Δ ΞϓϦέʔγϣϯͷ શͯͷঢ়ଶ ҰͭͷλεΫͷ ঢ়ଶ
ঢ়ଶ͔ΒΛಋ͘ λεΫϦετΛ༩͑Δͱʜ ඞཁͳΛλεΫϦετ͔Β ಋ͖ग़ͯ͠ʜ )5.-Λॻ͖ग़͢ ؔܕ 'VODUJPOBM
ΞΫγϣϯͷͨͼʹ࣍ͷঢ়ଶ "DUJPOΛड͚ͯࠓͷঢ়ଶ͔Β ৽͍͠ঢ়ଶ ʢߋ৽͠ͳ͍ʣ
ΞΫγϣϯܾΊ͓ͯ͘
Ͳ͏ͬͯߋ৽͢Δʁ .PEFM .PEFM .PEFM λεΫՃ λεΫྃ ྃࡁΈ λεΫআ ೖྗ͞ΕͨΞΫγϣϯʹ Ԡͯ͠৽͍͠ঢ়ଶʹ͢Δ
ʹϦΞΫςΟϒ(Reactive)
·ͱΊ
ϦΞΫςΟϒདྷͯ·͢ • ϦΞΫςΟϒͩΜͩΜਁಁ͖ͯͨ͠ • React.jsͱͦͷϑϨʔϜϫʔΫ(Flux) • FluxϑϨʔϜϫʔΫͷҰͭReduxelmΛࢀ ߟʹ͍ͯ͠Δ
ঢ়ଶΛѲͯ͠·͔͢ʁ • Β͵ؒʹ૿͑Δϑϥά • ঢ়ଶύλʔϯͷݟམͱ͠ɾෆ߹ • ͦΕɺؔܕͷߟ͑ํͰ͍͚·͢Αʁ • ඞཁͳঢ়ଶΛߜΓࠐΉ •
ঢ়ଶ͔ΒΛऔΓग़͢Α͏ʹ͢Δ
͋Γ͕ͱ͏͍͟͝·ͨ͠