2019年 Wantedly 新人研修の資料です。
フロントエンドというざっくりしたテーマについての講義です。Wantedly のフロントエンドで使われている技術を見つつ、これからの Wantedly でのフロントエンド開発をするために知っておいてほしい技術などをデモをしつつ話しました。
©2019 Wantedly, Inc.Frontend EngineeringNew Joiner Training 2019May 22, 2019 - Yuki Yamada@ Wantedly
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©2019 Wantedly, Inc.͡Ίʹࣗݾհͱֶ͔ΜͰ΄͍͜͠ͱͱ͔
©2019 Wantedly, Inc.ࣗݾհYuki YamadaFrontend Engineer @ Infrastructure Squad݄ʹ৽ଔೖࣾϑϩϯτΤϯυͷ։ൃج൫Λࢧ͑Δ͜ͱ͕ࣄ(JU)VCZBNBEBZVLJ5XJUUFSJLVVZBEBNBZw 8BOUFEMZ$IBUͰؒఆऀΠϯλʔϯw 8BOUFEMZ1FPQMFͰؒΞϓϦέʔγϣϯΤϯδχΞw 8BOUFEMZ7JTJUͰऑΞϓϦέʔγϣϯΤϯδχΞw ݱࡏ*OGSBTUSVDUVSF4RVBEͰϑϩϯτΤϯυͷج൫։ൃ
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©2019 Wantedly, Inc.8BOUFEMZͰϑϩϯτΤϯυͷ͋ΔαʔϏεͨ͘͞Μ͋Γ·͢
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©2019 Wantedly, Inc.ͳͥଟछଟ༷ͳϥΠϒϥϦͬͯΔ ϑϩϯτΤϯυͷ͋ΔαʔϏε
©2019 Wantedly, Inc.ͳͥଟछଟ༷ͳϥΠϒϥϦΛͬͯΔ Real world es201x and futureαʔϏεͰϑϩϯτΤϯυͷ։ൃΛ࢝͠Ίͨ࣌ͰͷྲྀߦΓΛબ͍ͯ͠Δ͜ͱ͕ଟ͍ɻ࣌ྲྀʹ͔ͬͬͨํ͕ྑ͍ଟ͍ͨΊ8BOUFEMZ7JTJU͔ΒͳͷͰK2VFSZ#BDLCPOFɻͦͷޙ"OHVMBS+4Λܦͯ3FBDU3FEVY8BOUFEMZ1FPQMF͔ΒͳͷͰ3FBDU3FEVYΛ࠷ॳ͔Β࠾༻8BOUFEMZ$IBU͔Β"OHVMBS+4ࣾαʔϏεύοͱࢼͯ͠ग़͢Έ͍ͨͳ͜ͱ͕͍ͨ͠ͷͰ؆୯ &BTZʹ͑Δ7VF͕ଟ͍https://speakerdeck.com/mizchi/real-world-es201x-and-future?slide=11
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©2019 Wantedly, Inc. ύοέʔδϚωʔδϟ #VJMEपΓͷπʔϧ -JOUFS'PSNBUUFS 6*ϥΠϒϥϦ ςετϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़ύοͱ͜ͷߨٛதʹͤΔͷΛબΜͰ·͢
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©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़ύοέʔδϚωʔδϟ%&.0࣮ߦՄೳͳϥΠϒϥϦΛ࣮ߦ͢Δํ๏͓͍ͬͯͯଛͳ͍ɻҎԼͷ࣮ߦ݁Ռશͯಉ݁͡ՌQBDLBHFKTPOͷTDSJQUTʹهࡌ͕͋ͬͨΒͦͷݶΓͰͳ͍$ node_modules/.bin/jest --help$ yarn jest --help$ npx jest --help
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़#VJMEपΓͷπʔϧ8BOUFEMZͰ#BCFMͱ͍͏+BWB4DSJQUͷ࠷৽ͷߏจΛ͑ΔΑ͏ʹ͢ΔτϥϯεύΠϥΛ͍ͬͯΔɻ·ͨผʹ+BWB4DSJQUʹ੩తܕ͚Λಋೖͨ͠5ZQF4DSJQUΛ͍ͬͯΔɻ#BCFM͕ग़ͨͱ͖ʹ5ZQF4DSJQUͷαϙʔτ͕͞Εͯɺ#BCFMͰ5ZQF4DSJQUͷτϥϯεύΠϧ͕Ͱ͖ΔΑ͏ʹͳͬͨɻ5ZQF4DSJQUͦͷ··5ZQF4DSJQUͷίʔυΛτϥϯεύΠϧͯ͘͠ΕΔɻ#BCFMͷ5ZQF4DSJQUQMVHJO"45Λղੳͯ͠ܕͷఆٛΞϊςʔγϣϯɺܕͷFYQPSU෦ͳͲΛTUSJQ͔ͯ͠ΒτϥϯεύΠϧͯ͘͠ΕΔɻ
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़#VJMEपΓͷπʔϧͲͪΒͰܕΛ͍ͭͭهड़͢Δ͜ͱͰ͖Δ͕ɺܕͷԸܙΛड͚ΔͨΊʹΤσΟλͷ֦ுΛͬͨΓUTDίϚϯυͰܕͷղੳΛΒͤΔඞཁ͕͋Δɻ·ͨߏจΛ&4ͷߏจʹམͱ͠ࠐΉ෦ͷ࣮ͦΕͧΕ͕͍࣋ͬͯΔͨΊɺಉ͡ίʔυͰ#BCFMͰτϥϯεύΠϧͨ࣌͠ͱ5ZQF4DSJQUͰτϥϯεύΠϧͨ࣌͠ͷ݁Ռඍົʹҧ͏ɻීஈҙࣝ͢Δ͜ͱͳ͍ɻ#BCFMͰαϙʔτ͞Ε͍ͯͳ͍5ZQF4DSJQUͷߏจ͋ΔͷͰҙ͢ΔɻIUUQTCBCFMKTJPEPDTFOCBCFMQMVHJOUSBOTGPSNUZQFTDSJQUDBWFBUT
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़#VJMEपΓͷπʔϧ%&.0#BCFMͱ5ZQF4DSJQUͷτϥϯεύΠϧ݁Ռগ͠ҧ͏ɻײ֮తʹ͓͍֮͑ͯͯ΄͍͠ͷͰ%&.0#BCFMͷ߹const a = [1, 2, 3];const b = [...a, 4];var a = [1, 2, 3];var b = [].concat(a, [4]);
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़#VJMEपΓͷπʔϧ%&.0#BCFMͱ5ZQF4DSJQUͷτϥϯεύΠϧ݁Ռগ͠ҧ͏ɻײ֮తʹ͓͍֮͑ͯͯ΄͍͠ͷͰ%&.05ZQF4DSJQUͷ߹const a = [1, 2, 3];const b = [...a, 4];var a = [1, 2, 3];var b = a.concat([4]);
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़-JOUFS'PSNBUUFS8BOUFEMZͰ-JOUFSͱͯ͠&4-JOUΛɺ'PSNBUUFSͱͯ͠1SFUUJFSΛ࠾༻͍ͯ͠Δɻ&4-JOUϓϥάΠϯػߏ͕͔ͬ͠Γ͍ͯͯ͠ɺಠࣗͷϧʔϧͷఆٛ͘͢͠ͳ͍ͬͯΔɻ"45Λࠪͭͭ͠తͷ/PEFʹདྷͨͱ͖ʹ͋Δ݅ԼͩͬͨΒΤϥʔϫʔχϯάͱͯ͠Ϩϙʔτ͢Δͱ͍ͬͨ͜ͱ͕Ͱ͖Δɻ&4-JOUຊମͷϧʔϧʹՃ͑ͯFTMJOUQMVHJOSFBDUͳͲͷϓϥάΠϯΛಋೖ͢Δ͜ͱͰຊମʹͳ͍ϧʔϧͰίʔυΛνΣοΫ͢Δ͜ͱ͕Ͱ͖Δɻ
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़-JOUFS'PSNBUUFS1SFUUJFSίϛϡχςΟʹΑͬͯ͜ͷه๏͕͍͍ΑͶܾͬͯ·ͬͨϧʔϧʹԊͬͯϑΥʔϚοτͯ͘͠ΕΔ'PSNBUUFSɻͱ͍͑ઃఆʹΑͬͯม͢Δه๏͕બΔͷͰPQJOJPOBUFEͳ'PSNBUUFSͱͯ͠ޭ͍ͯ͠ΔɻϓϥάΠϯॆ࣮͍ͯͯ͠+BWB4DSJQU5ZQF4DSJQUҎ֎ͷݴޠαϙʔτ͞Ε͍ͯΔɻ8BOUFEMZͰ8BOUFEMZඪ४ͷ&4-JOUDPOpH1SFUUJFSDPOpHΛOQNͰ৴͍ͯ͠ΔͷͰͦΕΛಋೖ͢Δ͔ɺXBOUFEMZGSPMJOUͰ։ൃ͍ͯ͠ΔGSPMJOUΛͬͯ-JOU'PSNBU͢ΔΑ͏ʹ͍ͯ͠Δɻ
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©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़-JOUFS'PSNBUUFS%&.0
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©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़6*ϥΠϒϥϦTUZMFEDPNQPOFOUT3FBDUͰ$44Λ͍͍ײ͡ʹөͤ͞ΔͨΊͷϥΠϒϥϦɻ3FBDUࣗମTUZMFͱ͍͏QSPQTʹΦϒδΣΫτΛͨ͠ΒΠϯϥΠϯ$44͕ө͞ΕΔ͕$44ͷϓϩύςΟͱͦͷΦϒδΣΫτͷରԠΛߟ͑ͭͭΔඞཁ͕͋ΔͷͰগ͠໘ʹͳΔɻաڈͷࢿ࢈͑ͳ͍ͨΊɺ$44JO+4$44.PEVMFTͳͲͷղܾํ๏͕ఏҊɾ࣮͞Ε͖͕ͯͨࠓͰTUZMFEDPNQPOFOUT͕༗໊ʹͳ͍ͬͯΔɻ5BHHFEUFNQMBUFMJUFSBMͱ͍͏ه๏Λͬͯ+4ϑΝΠϧͷதʹ$44Λهड़͢ΔͱTUZMFEDPNQPOFOUT͕Ϗϧυ࣌ϥϯλΠϜͰ$44ʹมͯ͠ΫϥεΛࢦఆ͢Δܗʹͳ͍ͬͯΔɻ
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़6*ϥΠϒϥϦ%&.0 export class Counter extends React.PureComponent {constructor(props) {super(props);this.state = { count: 0, timer: null };}componentDidMount() {const timer = setInterval(() => {this.setState(state => ({ count: state.count + 1 }));}, 1000);this.setState({ timer });}componentWillUnmount() {clearInterval(this.timer);}render() {return {this.state.count};}}ӈͷΑ͏ͳ$MBTTߏจͰهड़͞Εͨඵ͓͖ʹΧϯτΞοϓ͍ͯ͘͠ίϯϙʔωϯτΛ)PPLT"1*Λͬͯॻ͖͢ͱͨ͠ΒͲ͏͢Δʁ
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़6*ϥΠϒϥϦ%&.0 function Counter() {const [count, setCount] = React.useState(0);const savedCallback = React.useRef();function callback() {setCount(count + 1);}React.useEffect(() => {savedCallback.current = callback;});React.useEffect(() => {function tick() {savedCallback.current();}let id = setInterval(tick, 1000);return () => clearInterval(id);}, []);return {count};}ӈͷΑ͏ͳ$MBTTߏจͰهड़͞Εͨඵ͓͖ʹΧϯτΞοϓ͍ͯ͘͠ίϯϙʔωϯτΛ)PPLT"1*Λͬͯॻ͖͢ͱͨ͠ΒͲ͏͢ΔʁVTF4UBUFVTF3FGVTF&GGFDUͷΈ߹Θ͕ͤඞཁɻͪΐͬͱ͍͚͠ͲɺڧྗͳͷͳͷͰษڧͯ͠Έͯ΄͍͠ɻ
©2019 Wantedly, Inc.ϑϩϯτΤϯυΛ։ൃ͢Δͱ͖ʹ͍ͬͯΔٕज़ςετϑϩϯτΤϯυͰςετΛ͢ΔํͳͷͰհɻ8BOUFEMZͰςετϑϨʔϜϫʔΫͱͯ͠+FTUΛ࠾༻͍ͯ͠Δɻ.PDIBͱ͔,BSNBͱ͔ଘࡏ͢Δ͚Ͳςετͷ݁Ռ͕ݟ͔ͬͨ͢Γઃఆͷ͕͍͍͋ͬͯ͢͢͠͞ɻ+FTU/PEFKTͷϓϩδΣΫτͰΘΕΔ͕ɺKTEPNͱ͍͏/PEFKTڥͰ%0."1*͕͑ΔϥΠϒϥϦΛͬͯϑϩϯτΤϯυͷςετͰ͖ΔɻDSFBUFSFBDUBQQͱ͔Λͬͨͱ͖ʹσϑΥϧτͰ࠾༻͞Ε͍ͯΔςετϑϨʔϜϫʔΫͳͷͰ͓֮͑ͯ͘Ձ͋Δɻ
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