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const vs let
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Yosuke Furukawa
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December 09, 2015
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const vs let
忘年🍣
Yosuke Furukawa
PRO
December 09, 2015
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Transcript
ͦΖͦΖMFUWTDPOTU ʹܾணΛ͚͍ͨ !ZPTVLF@GVSVLBXB
ՄมੑΛ࠷খݶʹ͢Δ w &⒎FDUJWF+BWB w શͯͷpFMEΛpOBMQSJWBUFʹ͢Δ w Մมͳͷઐ༻ͷΞΫηεखஈΛ༻ҙ͢Δ TFUUFSΈ͍ͨͳ
ՄมੑΛಋೖ͢ΔͱԿ͕μϝ ͳͷ͔ w &⒎FDUJWF+BWB w த͕উखʹॻ͖ΘΔͷΛ͙ͨΊʹޚతί ϐʔΛ͠ͳ͖Ό͍͚ͳ͍͕࣌͋Δɻ w εϨουΞϯηʔϑ w
Ωϟογϡʹऑ͍
͡Ό͋ٯʹ+4ʹͦΕඞཁͳ ͷ͔ w த͕উखʹॻ͖ΘΔͷΛ͙ͨΊʹޚతίϐʔΛ͠ͳ͖Ό͍ ͚ͳ͍͕࣌͋Δɻ w Ұ൪͋Γͦ͏ɻ w εϨουΞϯηʔϑ w
8FC8PSLFSBOE4IBSFE"SSBZ#V⒎FSͱ͔ w Ωϟογϡʹऑ͍ w ͔֬ʹɺͰͦΜͳΩϟογϡ+4Ͱ͏ͱϝϞϦϦʔΫͷݩ ʹͳΓͦ͏ɻ
͡Ό͋ٯʹ+4ʹͦΕඞཁͳ ͷ͔ w ҙຯʢബ͍͚Ͳʣ͋Δ w εϨουηʔϑͱ͔ࠓແ͍͔ΒඍົͬͪΌඍ ົ w େن։ൃͱ͔ͳΒҙຯ͋ΔʢෆมੑͰյΕ ΔͷΛ͙ޮՌʣɻ
DPOTU͚ͩͰ͛Δͷ͔ w ແཧ w DPOTU 0CKFDUGSFF[F w .BQ4FUJNNVUBCMFKTΈ͍ͨͳίϨΫγϣ ϯϥούʔ͕ඞཁʹͳΓͦ͏
ͦ͜·ͰΔͷʁ w ͬͯͳ͍X ݱঢ়ਓମ੍ w Θ͟Θ͟GSFF[Fͪΐͬͱ໘ɻ w ·ͯ͠JNNVUBCMFKTϥΠϒϥϦʹཔΔͱ͔ ΑͬΆͲͷঢ়گɻ
͡Ό͋Δҙຯ͋Δͷʁ w ݸਓతͳΔҙຯ w ϝϞϦͷઅ w ಡΉ࣌ʹAMFUAPSAWBSA͕͋Δͱɺมߋ͢Δ Մೳੑ͕͋Δมͱͯ͠ݟͳ͍ͱ͍͚ͳ͍ɻ w ʰมߋ͕ͳ͍ʱ͍ͬͯ͏͚ͩͰಡΉ࣌ʹָ
͡Ό͋Δҙຯ͋Δͷʁ w ྑ͔ͬͨ͜ͱ͋Δ w MFU͏ͱ͖GPSจΛϒϯճ͚࣌ͩ͢ʹݶఆ͞ ͤͨ w ٯʹMFUͰGPSจΛճͦ͏ͱͯ͠ΔίʔυΛݟΔ ͱʮ͓ʁʯͬͯؾ͚ͮΔΑ͏ʹͳͬͨɻ w
GPSͰճ͢ΑΓ"SSBZNFUIPEͬͯNBQͱ͔ pMUFSͱ͔SFEVDFͰ͏·͘ॻ͚ΔͰ͠ΐͬͯͳΔ
͡Ό͋Δҙຯ͋Δͷʁ w Γ͍ͨ͜ͱDPOTUΛڧ੍ͤ͞Δ͜ͱͰ w ॳֶऀͱҰॹʹͬͨ࣌ʹ͍ͭͬͪΌ͏۪ ͳॲཧ GPSจ͙Δ͙ΔJGจͰೖ ΛݮΒ ͢ w
มߋՄೳͳঢ়ଶΛͪΐͬͱ͚ͩগͳͯ͘͠ɺಡ Ή࣌ͷίετΛݮΒ͢
MFUͷ͕DPOTUΑΓ͍͡ΌΜ w ͦΕͳʁ w ͰɺͦͦͦΜͳʹͨ͘͞Μมએݴ͠ͳ ͍ɻ w MFU͕ଟ͍ͱͦΕͦΕͰมએݴଟ͍Μ͔ͩΒ ݟͳ͓ͨ͠΄͏͕ྑ͍ͷͰʁ
DMBTTͰpOBMͱ͔࡞ΕͶʔ ͠ w ͦΕͳʁ w EFGFOTJCMFDMBTTͱ͔ߟ͑ΕͯΔΒ͍ͥ͠ w IUUQXJLJFDNBTDSJQUPSHEPLVQIQ JETUSBXNBOEFGFOTJCMF@DMBTTFT
ͷதͰͷߟ͑ w ࠓҙຯ͕ബ͍ͩΖ͏͚ͲɺࠓޙεϨουηʔ ϑͱ͔ߟ͑ͳ͖Ό͍͚ͳ͍͕࣌+4དྷΔ ʢͣʣ w DMBTTͷදݱ͕গͳ͍͚Ͳࠓޙ૿͑Δͣ w DPOTUʹ͓ͯ͘͜͠ͱͰؔܕελΠϧͷॻ͖ํ ʹ׳Ε͓ͯ͘͜ͱʹҙຯ͋Δͣ
݁ w DPOTU͓͏