==と===を調べてみた

by igayamaguchi

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ͱ !*HBOJO5FB

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ͭͷ౳஋ԋࢉࢠ ᐆດͳൺֱ ݫີͳൺֱ // ᐆດͳൺֱͰ͸ܕΛൺֱ͠ͳ͍ > 1 == '1' true // ݫີͳൺֱͰ͸ܕ΋ൺֱ͢Δ > 1 === '1' false

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ࣗݾ঺հ w ࢁޱকر w ޚ஡ϊਫͷ8&#αΠτडୗ w ࠷ۙ͸$ "41/&5.7$ ɺ 1)1 w 7VFKTνϣοτ w झຯͰ-BSBWFM w 5XJUUFS*%!*HBOJO5FB

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&$."4DSJQU

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ͷॲཧͷྲྀΕ ܕͷൺֱ ஋ͷൺֱ

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ͷॲཧͷྲྀΕ ಉ͡ܕͰ͋Ε͹஋ͷൺֱ ஋ͷᐆດͳൺֱ

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ϓϦϛςΟϒܕͷᐆດͳൺֱ ยํͷ஋͕OVMMͰ΋͏ยํͷ஋͕ VOEFpOFEͷ৔߹ɺUSVF ยํͷ஋͕਺஋Ͱ΋͏ยํ͕จࣈྻͷ৔ ߹ɺจࣈྻΛ਺஋ʹม׵͔ͯ͠Β࠶౓ ஋͕ਅِ஋ͷ৔߹ɺ਺஋ʹม׵͔ͯ͠Β

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ࢀরܕͷᐆດͳൺֱ WBMVF0Gϝιου ϓϦϛςΟϒܕ͕ฦΔ৔߹ɺͦͷ஋Λ࢖ ༻ͯ͠࠶౓ > [1, 2, 3].valueOf() [ 1, 2, 3 ] > {a: 1, b: 2, c: 3}.valueOf() { a: 1, b: 2, c: 3 }

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ࢀরܕͷᐆດͳൺֱ UP4USJOHϝιου ϓϦϛςΟϒܕ͕ฦΔ৔߹ɺͦͷ஋Λ࢖ ༻ͯ͠࠶౓ > [1, 2, 3].toString() '1,2,3' > ({a: 1, b: 2, c: 3}.toString()) '[object Object]'