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【Go言語】名前付き戻り値
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Tomoki Ota
August 02, 2024
Programming
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【Go言語】名前付き戻り値
Go言語の名前付き戻り値の違いについて、解説しています。
【Qiita】
https://qiita.com/twrcd1227/items/2b6506ad57d3dc0b12d1
Tomoki Ota
August 02, 2024
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Transcript
Tomoki Ota ʲGoݴޠʳ໊લ͖Γ
໊લ͖Γͱʁ ໊લ͖Γͷ༻ྫ ແҙຯͳ໊લ͖Γ ՄಡੑҎ֎ͷ໊લ͖Γ ۭreturn ໊લ͖Γͷ෭࡞༻ ·ͱΊ ΞδΣϯμ
໊લ͖Γͱʁ
GoͰ໊લ͖Γ(Named Return Value) ͋·ΓΘΕͳ͍ ໊લ͖Γͱʁ
໊લ͖ΓΛ͏ͱɺҾͳ͠ͷۭreturnจΛݺͼग़ͤΔ ໊લ͖Γͱʁ
໊લ͖Γͷ༻ྫ
໊લ͖Γͷ༻ྫ
໊લ͖Γͷ༻ྫ
ແҙຯͳ໊લ͖Γ
ແҙຯͳ໊લ͖Γ errorܕ͕errorͰ͋Δ͜ͱࣗ໌
ՄಡੑҎ֎ͷ໊લ͖Γ
ՄಡੑҎ֎ͷ໊લ͖Γ
ՄಡੑҎ֎ͷ໊લ͖Γ
ۭreturn
ۭreturn ۭreturnҰൠతʹ͍ؔͰ༻͍ΒΕΔɻ ͍ؔͰ༻͢ΔͱɺՄಡੑ͕ѱ͘ͳΔͷͰɺ༻ ͖͢Ͱͳ͍ɻ
ۭreturn 1ͭͷؔͰɺۭreturnΛ͏͔ɺҾͷ͋Δ returnΛ༻͢Δ͔Ұ؏ੑΛอͭ͜ͱ͕େࣄɻ
໊લ͖Γͷ෭࡞༻
໊લ͖Γͷ෭࡞༻ ໊લ͖ΓɺθϩͰॳظԽ͞ΕΔͷͰɺҙਤ ͠ͳ͍όάΛট͘Մೳੑ͕͋Δ
໊લ͖Γͷ෭࡞༻ ઌ΄ͲͷgetCoordinatesΛ֦ ு͠ɺॅॴΛݕূͯ͠ɺ࠲ඪΛ औಘ͢Δɻ·ͨɺ్தͰɺί ϯςΩετͰɺσουϥΠϯ͕ ա͗ͯͳ͍͔Ωϟϯηϧ͞ Ε͍ͯͳ͍͔Λݕࠪ͢Δɻ
໊લ͖Γͷ෭࡞༻ if ctx.Err() != nilͰฦ͞ΕΤ ϥʔerr͕ͩɺerrʹԿ ೖ͓ͯ͠ΒͣɺθϩͰ͋Δ nil͔͠ฦ͞ͳ͍ɻ
໊લ͖Γͷ෭࡞༻ err໊લ͖ΓʹΑͬͯ ॳظԽ͍ͯ͠ΔͷͰɺ໊લ͖ Γ͕ͳ͚ΕɺίϯύΠϧ ΤϥʔͱͳΔɻ
ղܾ๏1
ղܾ๏2