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Looking back on JavaScript
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linyows
April 27, 2017
Technology
4
460
Looking back on JavaScript
GMO pepabo Tech Meeting/Hosting#3 で話した資料です
linyows
April 27, 2017
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Transcript
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ϓϦϯγύϧΤϯδχΞ 5PNPIJTB0EB!MJOZPXT ٕज़෦ٕज़ج൫νʔϜ
͓΅͍͑ͯ·͔͢ʁ
'BOJDઑͬͯ·ͨ͠ʢ࣌ wϦΞϧλΠϜը૾มʢࠓͱͳͬͯී௨ w''NQFHϥούʔͰNQɺBBD૬ޓมKPC wTͷϦιʔεΰϛߴআKPC ʑɺ/PEFKTΛ༻͍ͯΠϕϯτϧʔϓ ϊϯϒϩοΩ ϯάΛ׆༻͍ͯͨ͠
͜Μͳํ͕ରͰ͢ wK2VFSZΛͱΓ͋͑ͣͬͯ·͢Α wQSPUPUZQFͬͯԿɺK2VFSZͷલʹྲྀߦͬͨͭʁ w&$."4DSJQUʁॳΊͯฉ͖·ͨ͠
XFCΞϓϦέʔγϣϯ։ൃͯ͠Δ ͕ɺKT͕ϝΠϯ͡Όͳ͍
ͳΜͱͳ͘+4ॻ͍ͯ·͢ʂ
+BWB4DSJQUͷ͜Ε·ͰམͪͿΕ wॳ಄ϒϥβͱͱʹੜ w&$."ઃཱʢ+TDSJQUͱ+BWB4DSJQUޓͷಈ͖ʣ wͱ͜Ζ͕ҙݟ͕·ͱ·Βͳ͍ wͦͷؒʹ"DUJPO4DSJQUͷ'MBTI͕·Δ w/BUJWF+4ͳΜͯཁΒΜͷ͡Όͱ͍͏งғؾʜաڈͷͷ
+BWB4DSJQUͷ͜Ε·Ͱ࠶ͼ w(PPHMF.BQͰ"KBY͕ར༻͞Ε+4͕࠶ͼΛ͋ͼ࢝ΊΔ w$ISPNFͱͱʹWNܕͰߴͳ+4Τϯδϯ7͕ެ։͞ΕΔ w7ΛͬͨαʔόαΠυͷSVOUJNF/PEFKT͕ੜ͢Δ wࠒ͔Β#BDLCPOFKTච಄ʹ"OHVMBS+43FBDU7VFKTͳͲ ͷํόΠϯσΟϯάϑϨʔϜϫʔΫ͕ొ͍ͯ͘͠ w&$."4DSJQUUIFEJUJPO͕ެ։͞ΕΔ
ํσʔλόΠϯσΟϯάͱ w6*ͱσʔλͷํͰใʢมԽʣΛڞ༗͢Δ w6*ʢJOQVUʣΛมߋͨ͠Βσʔλʹө͠ɺσʔλ͕ߋ৽͞ΕͨΒ6* ͕มԽ w۩ମతʹWJFXNPEFMํͰΓͱΓ͢Δ
&$."4DSJQUUIFEJUJPO w͍ΘΏΔ&4&4 wݴޠ༷Λ࠶ఆٛ wࠓޙԿόάमਖ਼ͱখ͞ͳػೳՃͰຖϦϦʔε w͜Εʹ߹Θͤɺαʔόͱϒϥβͷ+4͕౷߹ʹ ͔͍ͬͯΔʁͣ
&4ͬͯ͑Δͷ w&4͕͏͙͢ʜ w֤αʔϏεͷޓදIUUQLBOHBYHJUIVCJP DPNQBUUBCMFFT wओཁϒϥβɺ࠷৽/PEFKTͰ΄΅ରԠࡁΈͳͷͰେ ମ͑Δͱݴ͑Δ wେମͳͷͰτϥϯεύΠϧΔͷ͕ແ
5SBOTQJMF τϥϯεύΠϥ w#BCFM w#VCMF τϥϯεύΠϧ͕ඞཁͳݴޠ w5ZQF4DSJQU w$P⒎FF4DSJQU
Ͱɺ&4Կ͕͏Ε͍͠ͷʁ
&4Ͱ͏Ε͍͜͠ͱ wQSPUPUZQFϕʔεͰઃܭ͠ͳͯ͘ྑ͘ͳΔDMBTTͱ FYUFOET w͖Ε͍ͳTZOUBYʢBSSPXGVODUJPOQSPNJTFʜ ʣ w4ZNCPMΒ.BQͳͲศརػೳ ৄ͘͠IUUQQPTUEDDFTDIFBUTIFFU
ʘͦͦ Α͘Θ͔Βͳ͍Ͱ͢ ϓϩτλΠϓϕʔε ʢͪͳΈʹ͖Ͱ͢ʣ
Ͱ͢ΑͶ ??
ܧঝͷྫ function Employee() { this.name = ""; this.dept = "general";
} function Manager() { Employee.call(this); this.reports = []; } Manager.prototype = Object.create(Employee.prototype); function Worker() { Employee.call(this); this.projects = []; } Worker.prototype = Object.create(Employee.prototype); function Engineer() { Partner.call(this); this.dept = "engineering"; } Engineer.prototype = Object.create(Worker.prototype); var opo = new Engineer(); opo.dept; // => "enginneering"
֦ுͷྫ function Point(x, y) { this.x = x; this.y =
y; } var p = new Point(3, 4); p.x // => 3 p.y // => 4 Point.prototype.r = function() { return Math.sqrt((this.x * this.x) + (this.y * this.y)); }; p.r();
ײ wܧঝͱ͍͏ΑΓίϐʔʹ͍ۙ wநԽ͞Εͨͷͱ࣮ଶͷ͕ؔͳ͍શ࣮ͯଶ wͳͷͰΑΓૄ݁߹ͳΦϒδΣΫτ
·ͱΊ w͍ྺ࢙ΛܦͯͬͱҰ؏ੑ͕ग़͖ͯͭͭ͋Δ wͨͩ͠ɺաظͳͷͰ༷ʑͳπʔϧपลϥΠϒϥϦ ͕ࢁग़ݱͯ͠ফ͍͍͑ͯͬͯΔ wࠓͳ͓৽͍͠ϓϩϙʔαϧ͕HJUIVCʹ্͕͍ͬͯͯ มԽ͍ͯ͠Δதɺϒϥβ͔ΒαʔόαΠυͨ·ͨ ϞόΠϧΧόʔ͢ΔݴޠແࢹͰ͖ͳ͍ͷͰ͋Δ
߈Ί͍ͯ͜͏+BWB4DSJQU
܅αϩϯʹ͓͍Ͱʁ ࠷৽ใΛνΣοΫˠ !MJOZPXT
͓ΘΓ