Go 1.24 のイテレータ from byte to bite

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Nozomu Ikuta 25th Feb. 2025 Go 1.24 ͷΠςϨʔλ from byte to bite

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@nozomuikuta X / GitHub • ιϑτ΢ΣΞΤϯδχΞ • Vue.js ೔ຊϢʔβʔάϧʔϓίΞελοϑ • UnJS ϝϯόʔ • Nuxt / Vite ίϯτϦϏϡʔλ

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ϩΰืूத Shibuya.go

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• ΠςϨʔλ͓͞Β͍ • bytes ύοέʔδͷΠςϨʔλ

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ΠςϨʔλ͓͞Β͍

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ΠςϨʔλ͓͞Β͍ • Go 1.23 Ͱ௥Ճ͞Εͨ • yield ʹΑͬͯ࿈ଓͨ͠஋ΛίʔϧόοΫؔ਺ʹΘͨؔ͢਺ͷ͜ͱ • ஋͕ͳ͘ͳΔ͔ yield ͕ false Λฦ͢ͱΠςϨʔγϣϯ͕ऴྃ͢Δ

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ΠςϨʔλ͓͞Β͍ • ͻͱͭͷ஋ΛΘͨ͢: Seq[V any] func(yield func(V) bool) • slices.All() • slices.Values() • slices.Backward() • slices.Sorted() • etc.

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ΠςϨʔλ͓͞Β͍ • ;ͨͭͷ஋ΛΘͨ͢: Seq2[K, V any] func(yield func(K, V) bool) • maps.All() • maps.Insert() • etc.

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bytes ύοέʔδͷΠςϨʔλ

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• bytes.Lines() • bytes.FieldsSeq() • bytes.SplitSeq() • bytes.SplitAfterSeq() • bytes.FieldsFuncSeq() bytes ύοέʔδͷΠςϨʔλ طఆ஋Ͱ෼ׂ / ࣗ༝஋Ͱ෼ׂ

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func Lines(s []byte) iter.Seq[[]byte] • newlineʢվߦʣͷ௚ޙͰ byte Λ۠ ੾ͬͯฦͯ͘͠ΕΔ • ֤஋͸຤ඌʹվߦ͕͍ͭͯ͘Δ • byte ຤ඌͷվߦͷ༗ແ͸ଚॏ͞Ε Δ bytes ύοέʔδͷΠςϨʔλ

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func FieldsSeq(s []byte) iter.Seq[[]byte] • unicode.IsSpace()ʢۭനʣʹ߹க͢ Δ෦෼Ͱ byte Λ۠੾ͬͯฦͯ͘͠ ΕΔ • ֤஋͸લޙʹۭനΛ;͘·ͳ͍ bytes ύοέʔδͷΠςϨʔλ

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func SplitSeq(s, sep []byte) iter.Seq[[]byte] • ೚ҙͷ byte slice Ͱ۠੾ͬͯฦͯ͠ ͘ΕΔ • ֤஋຤ඌʹ۠੾Γ෦෼Λ;͘·ͳ͍ bytes ύοέʔδͷΠςϨʔλ

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func SplitAfterSeq(s, sep []byte) iter.Seq[[]byte] • ೚ҙͷ byte slice Ͱ۠੾ͬͯฦͯ͠ ͘ΕΔ • ֤஋຤ඌʹ۠੾Γ෦෼Λ;͘Ή bytes ύοέʔδͷΠςϨʔλ

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• ೚ҙͷؔ਺Ͱ byte Λ۠੾ͬͯฦ͠ ͯ͘ΕΔ • unicode.IsX() ϝιουͳͲͱ૊Έ߹ Θͤͯ࢖͏ • ֤஋͸લޙʹ۠੾Γ෦෼Λ;͘·ͳ ͍ bytes ύοέʔδͷΠςϨʔλ func FieldsFuncSeq(s []byte, f func(rune) bool) iter.Seq[[]byte]

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·ͱΊ

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• bytes ύοέʔδʹΠςϨʔλ͕ಋ ೖ͞Εͨ • ʮ۠੾ͬͯϧʔϓʯ͕ΑΓศརʹ

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ࢀߟจݙ • https://go.dev/doc/go1.24 • https://pkg.go.dev/iter • https://pkg.go.dev/bytes

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Thank you