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ES2020 で来る7つの新機能
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53
May 08, 2020
Technology
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ES2020 で来る7つの新機能
53
May 08, 2020
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Transcript
ES2020Ͱ͑Δ7ͭͷ৽ػೳ גࣜձࣾGameWith ࣾLT ྩ25݄8 EcmaScript 11ճͷϦϦʔε
߶ ϑϩϯτΤϯυΤϯδχΞ Flash → Webήʔ → Ձ֨ൺֱαΠτˠ Unity →
WebϝσΟΞˠ YouTuberେखࣄॴ ˠGamewith(͍·ίί)
QoL ࢪࡦ
ि4Ͱ12km Run • ݄ؒ 200kmΦʔόʔͰނোϦεΫ • 2લʹΞΩϨε伳அ྾ • ఈےບԌ •
ͭ΅ϩʔϥʔ ¥ 3,880ԁ • ࣄ͠ͳ͕Β ࠷ۙϚεΫʹ׳Ε͖ͯͨ
ES2020 https://github.com/tc39/proposals
globalThis
࣮ߦڥ ͞·͟· • Webϒϥβʔ • αʔόʔαΠυ • εϚϗ • ϩϘοτ
άϩʔόϧ ΦϒδΣΫτ ඞͣଘࡏ͢Δ❗
None
ಠࣗͷΦϒδΣΫτϞσϧ
ෳͷڥͰಈ͘ίʔυ ڥΛఆ͢ΔؔΛ༻ҙ͍͕ͯͨ͠…
Ұ؏ͨ͠ํ๏ͰΞΫηε ͜Ε͔Β globalThis ϓϩύςΟ Ͱඪ४Խ
Promise.allSettled( )
Ҿ ϓϩϛεͷྻ
Promise.allsettled( )
Promise.allsettled( )
݁Ռ͕هड़͞Εͨྻ ݁ՌΛϑΟϧλϦϯά͢Δͷ͕༰қʹͳΔ
Null ߹ମԋࢉࢠ
exp ?? exp null ͔ undefined ͷͱ͖͚ͩӈลΛฦ͢
Null ߹ମԋࢉࢠ
Null ߹ମԋࢉࢠ
Null ߹ମԋࢉࢠ
exp ?? exp σϑΥϧτ Λࢦఆ͢ΔͨΊͷ৽͍͠ํ๏
ΦϓγϣφϧνΣʔϯԋࢉࢠ
ΦϒδΣΫτͷ தؒνΣοΫ ΦϒδΣΫτ null/undefined Λฦ͢ API
ΦϒδΣΫτͷωετ෦ϓϩύςΟ
ΦϒδΣΫτͷωετ෦ϓϩύςΟ
BigInt
Number.MAX_SAFE_INTEGER 2⁵³ ( 9007199254740991 )
BigInt ඌ n ͕͘
Number ͱڞଘ͍͠ ܕ͕ҧ͏ͷͰԋࢉͰ͖ͳ͍
Number ͱڞଘ͍͠ ਫ਼͕୲อ͞Εͯͳ͍
dynamic import( )
ಈతϩʔυ εΫϦϓτಈ࡞࣌ʹΞϓϦέʔγϣϯͷҰ෦Λऔಘ
dynamic import( ) αϙʔτͷྫ • ଟΧࠃαϙʔτͰɺϢʔβʔݴޠʹඞཁͳεΫϦϓτ͚ͩΛϩʔυ • ΞϓϦέʔγϣϯΛࡉΕʹͯ͠ɺ ԆϩʔυʹΑͬͯύϑΥʔϚϯεɾνϡʔχϯάΛߦ͏ •
Ϟδϡʔϧ͕ݟ͔ͭΒͳ͍߹ͷಈ࡞Λ࣮Ͱ͖Δ
ίʔϧόοΫ
async / await
੩తΠϯϙʔτͱͷҧ͍ Ϗϧυ࣌ʹධՁ͞ΕΔ੩తΠϯϙʔτͱൺֱ • ಈతΠϯϙʔτɺΠϯϙʔτͨ͠εΫϦϓτ͔ΒՄೳ • εΫϦϓτͷͲͷείʔϓ͔ΒͰɺಈతΠϯϙʔτՄೳ • ಈతΠϯϙʔτɺ੩తจࣈྻ͚ͩͰͳ͘ ςϯϓϨʔτจࣈྻड͚͚Δ
String.protype.matchAll
ΠςϨʔλʔΛฦ͢ ਖ਼نදݱʹରͯ͠Ϛον͢Δશจࣈྻ
จࣈྻΛݕग़
݁ՌΛྻڍ
݁ՌΛྻԽ
͍͞͝ʹ • ChromeͰશ෦͑·ͨ͠ • BabelϓϥάΠϯ༻ҙ͞Ε͍ͯ·͢ • TC39 ͷٞࣄGithubͰݟΒΕΔͷͰɺ ະདྷͷJSͷ༷͕֞ؒݟΕ·͢
Fin.