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es6
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Ship Features Fearlessly
Turn features on and off without deploys. Used by thousands of Ruby developers.
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Kakitaku00
June 18, 2020
Technology
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es6
Kakitaku00
June 18, 2020
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Transcript
&4&$."4DSJQUʹ͍ͭͯ
&4 ɾ&4ʁ
&4˓&$."4DSJQU˓˓ͬͯԿʁ w +BWB4DSJQUͷ༷ w &4˓&$."4DSJQUͷུশ w &4ʹʹʹ&4 w ུশͷํ͕ਁಁ͍ͯ͠Δ w
&4Ҏલͷόʔδϣϯ&4͔ΒޙʹϦϦʔε͞Εͨͷ
දʢൈਮʣ
&4ͬͯΑ͘ฉ͚͘ͲͳΜͰʁ w มఆએݴ MFUDPOTU w Ξϩʔؔ w ςϯϓϨʔτจࣈྻ w
Ϋϥεߏจ w εϓϨουԋࢉࢠ Ҏલͷͷ͔Βେ෯ʹվम͕ೖΓɺศརͳػೳ͕ଟ͘Ճ͞Εɺ༷ʑͳॲཧΛ ΑΓ؆ܿʹهड़͢Δ͜ͱ͕Ͱ͖ΔΑ͏ʹͳΓɺ+BWB4DSJQUͷذͱͳͬͨҝ ͞Βʹ৭ʑʜ ࠓճมએݴΛ۷ΓԼ͛·͢
มએݴWBSMFUͷҧ͍ WBSؔͰ͋ΕͲ͜ͰࢀরՄೳ MFUJGGPSͷϒϩοΫ \^ ͷΈࢀরՄೳ function differenceScope(variable) { if (variable
=== "var") { var scope = "varͰએݴ͠·ͨ͠"; } if (variable === "lef") { let scope = "letͰએݴ͠·ͨ͠"; } console.log(scope); } differenceScope("var"); // varͰએݴ͠·ͨ͠ differenceScope("let"); // undefined
ఆએݴDPOTU w ͷ࠶ೖ͕Ͱ͖ͳ͍ w ม͚ͩͷએݴෆՄ w MFUͱಉ͡ϒϩοΫείʔϓ w ྻͷཁૉɺΦϒδΣΫτͷͷ ՃɾมߋՄೳ
// ࠶ೖෆՄ const num = 1; num = 3; // Τϥʔ // มએݴ var text1; // ok let text2; // ok const text3; // Τϥʔ // ྻʹཁૉΛՃ const array = [1, 2, 3] array.push(4) // [1, 2, 3. 4]
·ͱΊ w ࠓޙWBSΛ͏ඞཁ͕͋Δ໘ͳ͍ w มఆΛએݴ͢Δ࣌·ͣDPOTUΛ͓͏ w DPOTUΛ༻͢ΔࣄͰ͕࠶ೖ͞ΕΔࣄ͕ͳ͍ͱ͍͏ࣄ͕ίʔυΛݟΔ͚ͩ ͰΘ͔ΔҝɺՄಡੑɾϝϯςφϯεੑ্͕͕Δ w GPSจ࠶ೖ͕ඞཁͳՕॴʹMFUΛ༻͢Δ
ʮ͋ɺMFU͕ΘΕ͍ͯΔ͔Β͜ͷޙ࠶ೖ͞ΕΔΜͩͳʂʯ͜Ε͕ॏཁ