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Ramdaで手軽に関数型言語を始めよう
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kaidouji85
May 03, 2016
Technology
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300
Ramdaで手軽に関数型言語を始めよう
初夏のJavaScript祭2016のLTスライドです。
kaidouji85
May 03, 2016
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Transcript
RamdaͰखܰʹ ؔܕݴޠΛ࢝ΊΑ͏ ɹ༎հ 2016/05/14 ॳՆͷJavaScriptࡇ
ࣗݾհ ༎հ ϓϩάϥϚʔ ؔܕݴޠΛษڧத ࠓظͷՇϠϞτ͞Μ ͍;Γͩͱ؋ਪ͠ twitter @pegass85 facebook yuusuke.takeuchi.96
ૣͰ͕͢Έͳ͞Μ javascriptͷϧʔϓॲཧʹ ࠔ͍ͬͯ·ͤΜ͔
ͦͷɺؔܕݴޠͷߟ͑ํΛ ͍ͬͯΕղܾͰ͖Δ͔
ࠓͷΞδΣϯμ खଓ͖ܕ -> ؔܕ ؔܕݴޠͷجຊతͳߟ͑ํ ࣮ྫ υΩϡϝϯτྨͳͲ
ࠓͷΞδΣϯμ खଓ͖ܕ -> ؔܕ ؔܕݴޠͷجຊతͳߟ͑ํ ࣮ྫ υΩϡϝϯτྨͳͲ
͜ͷॲཧΛͲ͏ॻ͖·͔͢ʁ TODOϦετ͕͋ͬͨͱ͠·͢ ϦετͰมߋ͕͋ͬͨͷ͚ͩΛऔΓग़͢ ˢͷσʔλΛAPIʹ͛ΔͨΊʹมߋ͢Δ
forΛͬͨΓํ let postData = []; for (let i in todo)
{ if(todo[i].isChanged) { postData.push(convertData(todo[i])); } }
Ͳ͕͜ͳͷ͔ʁ ωετ͕ਂͯ͘ෳࡶ ॲཧΛશ෦ݟͳ͍ͱpostData͕Ͳ͏ͳ͔ ͔Βͳ͍ ͜Ε͕30ߦ͘Β͍ʹͳͬͯɺωετ͕3ஈʹͳ Δͱखʹෛ͑ͳ͍ɾɾɾɾɾɾ
ͦ͜ͰRamdaͷग़൪ʂʂ
RamdaΛͬͯಉ͡ॲཧΛॻ͘ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ωετ͕ਂ͘ͳͯ͘γϯϓϧʹ ͔͠ɺมͷೖ͔ͯ͠Β มΘͬͯͳ͍
ࠓͷΞδΣϯμ खଓ͖ܕ -> ؔܕ ؔܕݴޠͷجຊతͳ໋ྩ ࣮ྫ υΩϡϝϯτྨͳͲ
ؔܕݴޠͷେݪଇ ྻͷશཁૉʹ ಉ͡ॲཧΛ͢Δ
جຊͦͷ̍ શཁૉΛม͢Δ MAP
جຊͦͷ2 ݅ʹ߹͏ཁૉ͚ͩ͢ FILTER
͖ͬ͞ͷ՝ΛؔܕͰߟ͑Δͱ FILTER มߋͨ͠Ϩίʔυ͚ͩ͢ MAP ͬͨͷΛ API༻ʹσʔλม ɾɾɾͱͳΔ
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); filter มߋͨ͠ίʔυ͚ͩ͢
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ݅͢ɺؔͱͯ͠ఆٛ͢Δ
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ͜͏͍͏ͷΛؔܕݴޠͰϥϜμࣜͱ͍͏
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ؔͷϑΥʔϚοτҎԼͷ௨Γ ୈҰҾɿɹྻཁૉͷ Γɹɿɹboolean(trueͰ͢)
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ͜ͷྫͰisChanged͕trueͳΒ มߋ͞Εͨͱݟͳ͍ͯ͠Δ ɹˣ มߋ͞Εͨཁૉ͚ͩΛ͢ͱ͍͏ҙຯʹͳΔ
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ͜͜ʹFILTERରͷྻΛࢦఆ͢Δ
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); MAP API༻ʹσʔλม
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ͜͜ʹσʔλม͢ΔؔΛࢦఆ͢Δ
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ؔͷϑΥʔϚοτҎԼͷ௨Γ ୈҰҾɿɹྻཁૉͷ Γɹɿɹมޙͷσʔλ
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ͜ͷྫͰconvertDataͰ σʔλม͢ΔͷͰɺ ͜ΕΛͦͷ··ࢦఆ͢Δ
ίʔυͱͷରԠ let chanegedList = R.filter(data=>data.isChanged, todo); let postData = R.map(convertData,
chanegedList); ͜͜ʹMAPରͷྻΛࢦఆ͢Δ
͜Μͳײ͡Ͱ MAPɺFILTERͳͲͷૢ࡞Λ Έ߹ΘͤͯॲஔΛॻ͍͍ͯ͘ ωετΛਂ͘͢Δ ͱ͍͏ߟ͕͑ͳ͍
ࠓͷΞδΣϯμ खଓ͖ܕ -> ؔܕ ؔܕݴޠͷجຊతͳ໋ྩ ࣮ྫ υΩϡϝϯτྨͳͲ
͜ͷॲཧΛؔܕͰॻ͍ͯΈΑ͏ TODOϦετ͕͋Γ·ͨ͠ 1Ϩίʔυ୯ҐͰΤϥʔνΣοΫAPIΛݺͿ Τϥʔ͚ͩநग़ͯ͠ɺΤϥʔσʔλʹมԽ͢Δ
·ͣPromise.allͰ·ͱΊͯ ΤϥʔνΣοΫ·Ͱࢥ͍ͭ͘ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { }); ˞isErrorPromiseΛฦ͠·͢
·ͣPromise.allͰ·ͱΊͯ ΤϥʔνΣοΫ·Ͱࢥ͍ͭ͘ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { }); TODOͷ֤Ϩίʔυ͝ͱʹ ΤϥʔνΣοΫAPIΛ࣮ߦ ˞isErrorPromiseΛฦ͠·͢
·ͣPromise.allͰ·ͱΊͯ ΤϥʔνΣοΫ·Ͱࢥ͍ͭ͘ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { }); TODOϦετΛΤϥʔνΣοΫ APIͷPromiseϦετʹมߋ ˞isErrorPromiseΛฦ͠·͢
˞isErrorPromiseΛฦ͠·͢ ·ͣPromise.allͰ·ͱΊͯ ΤϥʔνΣοΫ·Ͱࢥ͍ͭ͘ let promiseList = R.map(todo => isError(todo), todos);
Promise.all(promiseList).then(resps => { }); ͍ͭ͜ΛPromise.allʹ ͛ͯฒྻ࣮ߦ͢Δ
ͰɺTODOຊମͱΤϥʔνΣοΫ͕ผʑͷྻ ͔ͩΒɺॲཧ͕ࡶʹͳΓͦ͏ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { }); TODOຊମ ΤϥʔνΣοΫ݁Ռ
͜͜Ͱ৽͍͠ثΛհ 2ͭͷྻΛ߹ମͤ͞Δ ZIP
ZIPͷಈ࡞ྫ R.zip([1,2,3], ['a','b','c']) => [[1,'a'], [2, 'b'], [3, 'c']]
ZIPͰTODOϦετͱ ΤϥʔνΣοΫͷ݁ՌΛ߹ମͤ͞Δ TODO1 TODO1ͷΤϥʔνΣοΫ݁Ռ TODO2 TODO2ͷΤϥʔνΣοΫ݁Ռ ͜͜·Ͱ͘Εޙ؆୯ʂʂ ɾɾɾ
Promise.allͰ શϨίʔυͷΤϥʔAPIΛݺͿ zip todoϦετͱPromiseͷϨεϙϯεΛ߹ମ filter ΤϥʔͷͷΛ͢ map Τϥʔσʔλʹม͢Δ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); });
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); R.pipeͰෳͷॲཧΛܨ͔͚͛ͯ·͢
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); ͜͜ʹ࠷ॳͷॲཧʹ͢ҾΛࢦఆ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); ࠓճTODOຊମͱ ΤϥʔνΣοΫ݁Ռ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); TODOຊମͱΤϥʔνΣοΫ݁ՌΛ߹ମ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); R.zipͷ݁Ռ͕͍ͭ͜ͷॲཧରʹͳΔ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); item[0] : todoຊମ item[1] : ΤϥʔνΣοΫ݁Ռ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); ͜ͷ݅Τϥʔ͕͋Δ Ϩίʔυ͚ͩΛ͢ͱ͍͏ҙຯ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); ͬͺΓR.filterͷ݁Ռ͕ೖྗʹͳΔ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); ͜͜ͰΤϥʔσʔλʹม͢Δ
ίʔυͰॻ͘ͱ͜͏ͳΓ·͢ let promiseList = R.map(todo => isError(todo), todos); Promise.all(promiseList).then(resps
=> { let errorData = R.pipe( R.zip, R.filter(item => item[1].isError), R.map(item => getErrorData(item[0].id)) )(todos, resps); }); Τϥʔσʔλͷྻ͕֨ೲ͞ΕΔ
ෳࡶͦ͏ͳॲཧͰ ׂͱγϯϓϧʹ͔͚·ͨ͠ ͜ͷΑ͏ʹ
ࠓͷΞδΣϯμ खଓ͖ܕ -> ؔܕ ؔܕݴޠͷجຊతͳ໋ྩ ࣮ྫ υΩϡϝϯτྨͳͲ
ެࣜαΠτ ϓϩδΣΫτϖʔδ http:/ /ramdajs.com/0.21.0/index.html υΩϡϝϯτ http:/ /ramdajs.com/0.21.0/docs/ Try Ramda (ϒϥβͰRamda͕ࢼͤ·͢)
http:/ /ramdajs.com/repl/?v=0.21.0
ίʔυͷαϯϓϧ ࠷ॳʹղઆͨ͠FILTERɺMAPΛ͏ͷ http:/ /goo.gl/AC4bfS ࠷ޙʹղઆͨ͠ZIPΛ͏ͭ http:/ /goo.gl/eoI0u9 TRY RamdaͰॻ͖·ͨ͠ ͙͢ʹಈ͖·͢ʂʂ
͝ਗ਼ௌ͋Γ͕ͱ͏ ͍͟͝·ͨ͠