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Goに無名関数の糖衣構文いれたらどうなるの? / Considering the introduction of the anonymous function syntax sugar into Go
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yuroyoro
October 28, 2019
Programming
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Goに無名関数の糖衣構文いれたらどうなるの? / Considering the introduction of the anonymous function syntax sugar into Go
GoCon 2019 LT
yuroyoro
October 28, 2019
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Transcript
Considering the introduction of the anonymous function syntax sugar into
Go !ZVSPZPSP (Pʹແ໊ؔͷҥߏจ͍ΕͨΒͲ͏ͳΔͷʁ
(Pͷແ໊ؔ var f = func(x int) int { return x
* 2 }
͍ΘΏΔ"SSPX'VODUJPO͕΄͍͠ var f = (x int) int => { return
x * 2 }
ಈతܕ͖ͳݴޠͰʁ const f = (x) => { return x *
2 } +BWB4DSJQU 1ZUIPO f = lambda x: x * 2 3VCZ f = ->(x) { x * 2 }
੩తܕ͖ͳݴޠͰʁ const f = (x:number): number => { return x
* 2 } 5ZQF4DSJQU +BWB 4DBMB Function<Integer, Integer> f = (Integer x) -> { return x * 2; }; val f: (Int) => Int = (x) => { x * 2 }
(PͰ͜ΜͳܗͷߏจʹͳΓͦ͏ (name type, …) type => { function body }
ྫ͑͜Μͳ;͏ʹ (x int) int => { return x * 2
}
(PίϯύΠϥΛվ͠Α͏ʂ src/cmd/compile/ https://github.com/golang/go
ίϯύΠϥʹͭͷϑΣʔζ͕͋Δ 1. Parsing 2. Type-checking and AST transformations 3. Generic
SSA 4. Generating machine code TSDDNEDPNQJMF3&"%.&NE
ҥߏจͷՃͳͷͰɺ1BSTFSΛมߋ 1. Parsing 2. Type-checking and AST transformations 3. Generic
SSA 4. Generating machine code TSDDNEDPNQJMF3&"%.&NE
(Pͷߏจղੳ LL(1)
͍͍ͤͥͻͱͭઌͷτʔΫϯ͔͠ઌಡΈ͠ͳ͍ var f = ( x * 2 ) ↑
current: ( : _Lparen next : x : _Name
ͷ࣍ʹ໊લ͕དྷͨΒɺࣜ &YQS ʹܾ·Δ var f = ( x * 2
) ↑ current: ( : _Lparen next : x : _Name Expr
"SSPX'VODUJPO͕ೖΔͱʜʜ var f = ( x int ) int =>
{ … } ↑ current: ( : _Lparen next : x : _Name
ͷ࣍ʹ໊લ͕དྷͯɺࣜ &YQS ͔ؔ 'VOD5ZQF ͔ Θ͔Βͳ͍ var f = (
x int ) int => { … } ↑ current: ( : _Lparen next : x : _Name Expr or FuncType?
Ͳ͏ʹ͔ͳΒͳ͍
ߏจΛม͑ͯΈΑ͏ ->(name type, …) type { function body }
3VCZͬΆ͘ ͜ΕͳΒύʔεͰ͖Δͧ ->(x int) int => { return x *
2 }
AGVODAΛAAʹม͑Δ͚ͩ ->(x int) int => { return x * 2
} func(x int) int => { return x * 2 } ↓
ॻ͍ͯΈͨ src/cmd/compile/internal/syntax/parser.go | 2 +- src/cmd/compile/internal/syntax/scanner.go | 7 ++++++- src/cmd/compile/internal/syntax/token_string.go
| 4 ++-- src/cmd/compile/internal/syntax/tokens.go | 1 + 4 files changed, 10 insertions(+), 4 deletions(-)
ؔͷܕͰ͔͚ΔΑ͏ʹ͠Α͏ var f: ->(int) int = ->(x int) int {
return x * 2 }
%FNP package main import "fmt" func main() { f :=
->(x int, y int) int { return x + y } fmt.Printf("%d\n", f(3, 4)) fmt.Printf("%d", higherFunc(f)) } func higherFunc(f ->(x int, y int) int) int { return f(1, 2) }
Ͱɺ͑ͦ͏ʁ
ΈΜͳେ͖IUUQ4FSWFS http.HandleFunc("/", ->(w http.ResponseWriter, r *http.Request) { ... })
͠(Pʹ(FOFSJDT͕ೖͬͨΒ var arr = [1, 2, 3] arr.map( ->(x int)
int { return x * 2 })
AGVODAΑΓจࣈݮͬͨ
͋Μ·ΓมΘΒͳ͍ͷͰʜʜ
ͨͱ͑ɺ+BWBͰҾͷܕએݴΛ লུͰ͖Δ ↓ +BWB Function<Integer, Integer> f = (Integer x)
-> { return x * 2; }; Function<Integer, Integer> f = (x) -> { return x * 2; };
4DBMBͰฦΓܕΛਪͯ͘͠ΕΔ ↓ 4DBMB val f: Int => Int = (x:
Int) => { x * 2 } val f = (x: Int) => { x * 2 }
SFUVSOΛলུͰ͖Δݴޠଟ͍ ↓ +BWB Function<Integer, Integer> f = (x) -> {
return x * 2; }; Function<Integer, Integer> f = (x) -> { x * 2; };
͕ؔΘΕΔॴͷܕ͕Θ͔͍ͬͯΔ߹ ؔࣗମͷҾฦΓΛলུͰ͖Δ 4DBMB val arr = Array(1, 2) // Array<Int>#mapͷҾ
// (Int) => AͳͷͰҾ͕Intͱਪɺ // ؔຊମ͔ΒฦΓ͕Intͱਪ arr.map((x) => { x * 2 })
ແ໊Ҿ1MBDFIPMEFSͳͲɺ ͬͱলུͰ͖Δֻ͚ʜ 4DBMB val arr = Array(1, 2) // ແ໊ؔͷҾΛ
_ Ͱड͚Δ arr.map(_ * 2)
ແ໊ؔΛ؆ܿ໌ྎʹॻͨ͘Ίʹ ҥߏจͷଞʹ֤छͷলུه๏ - Argument Type Inference - Return Type Inference
- implicit return statement - anonymous argument placeholder
ͦͦͦ͜·Ͱলུ͍ͨ͠
Α͏͢Δʹ Conclusion
ؾ࣋ͪΑ͘ແ໊ؔΛॻͨ͘Ίʹ ߟ͑Δ͜ͱ͕ଟ͍ - Syntax - Type Inference - etc
(Pʹ͋ͬͨจ๏ͲΜͳܗ͕Α͍͔ɺ Ұॹʹߟ͑ͯΈ·ͤΜ͔