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==と===を調べてみた
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igayamaguchi
April 27, 2017
Technology
0
510
==と===を調べてみた
We Are JavaScripters! @6th の登壇資料です。
igayamaguchi
April 27, 2017
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Transcript
ͱ !*HBOJO5FB
ͭͷԋࢉࢠ ᐆດͳൺֱ ݫີͳൺֱ // ᐆດͳൺֱͰܕΛൺֱ͠ͳ͍ > 1 == '1' true
// ݫີͳൺֱͰܕൺֱ͢Δ > 1 === '1' false
ࣗݾհ w ࢁޱকر w ޚϊਫͷ8&#αΠτडୗ w ࠷ۙ$ "41/&5.7$ ɺ 1)1
w 7VFKTνϣοτ w झຯͰ-BSBWFM w 5XJUUFS*%!*HBOJO5FB
&$."4DSJQU
ͷॲཧͷྲྀΕ ܕͷൺֱ ͷൺֱ
ͷॲཧͷྲྀΕ ಉ͡ܕͰ͋Εͷൺֱ ͷᐆດͳൺֱ
ϓϦϛςΟϒܕͷᐆດͳൺֱ ยํͷ͕OVMMͰ͏ยํͷ͕ VOEFpOFEͷ߹ɺUSVF ยํͷ͕Ͱ͏ยํ͕จࣈྻͷ ߹ɺจࣈྻΛʹม͔ͯ͠Β࠶ ͕ਅِͷ߹ɺʹม͔ͯ͠Β
ࢀরܕͷᐆດͳൺֱ WBMVF0Gϝιου ϓϦϛςΟϒܕ͕ฦΔ߹ɺͦͷΛ ༻ͯ͠࠶ > [1, 2, 3].valueOf() [ 1,
2, 3 ] > {a: 1, b: 2, c: 3}.valueOf() { a: 1, b: 2, c: 3 }
ࢀরܕͷᐆດͳൺֱ UP4USJOHϝιου ϓϦϛςΟϒܕ͕ฦΔ߹ɺͦͷΛ ༻ͯ͠࠶ > [1, 2, 3].toString() '1,2,3' >
({a: 1, b: 2, c: 3}.toString()) '[object Object]'
֘͢Δͷ͕ ແ͚ΕGBMTF
ΊΑ͏