Golang で心を無にしてコードを書く

GolangͰ৺Λແʹͯ͠ίʔυΛॻ͘ mitsuse@github LINE Developer Meetup #11

͓·͑ɺͩΕΑɻ

͓·͑ɺͩΕΑɻ ɾಸྑͰࣗવݴޠॲཧ΍ͬͯͨ

͓·͑ɺͩΕΑɻ ɾಸྑͰࣗવݴޠॲཧ΍ͬͯͨ ɾݩPythonistaͰGopherͰVimmer

͓·͑ɺͩΕΑɻ ɾಸྑͰࣗવݴޠॲཧ΍ͬͯͨ ɾ࢓ࣄͰ͸Scalaॻ͍ͯΔɾAkkaྑ͍ ɾݩPythonistaͰGopherͰVimmer

͓·͑ɺͩΕΑɻ ɾಸྑͰࣗવݴޠॲཧ΍ͬͯͨ ɾGoCon 2015ࢀՃࣦഊ͠·ͨ͠ ɾݩPythonistaͰGopherͰVimmer ɾ࢓ࣄͰ͸Scalaॻ͍ͯΔɾAkkaྑ͍

Golangॻ͍ͯ·͔͢ʁ

Golangͱ͸ Go is an open source programming language that makes
it easy to build simple, reliable, and efﬁcient software. The Go Programming Language https://golang.org/

Golangͱ͸ Go is an open source programming language that makes
it easy to build simple, reliable, and efﬁcient software. The Go Programming Language https://golang.org/ γϯϓϧͰ৴པੑͷ͋Δޮ཰ͷྑ͍ιϑτ΢ΣΞͷߏஙΛָʹʂ

ͳͥॻ͘ͷ͔ɿ ৺Λແʹͯ͠ॻ͘ͷʹௐ౓ྑ͍͔Β

ͳͥॻ͘ͷ͔ɿ ৺Λແʹͯ͠ॻ͘ͷʹௐ౓ྑ͍͔Β ॆ࣮ͨ͠πʔϧ܈ʹΑΔαϙʔτɻ goίϚϯυʹϏϧυɾςετɾίʔυ੔ܗɾੜ੒ͳͲͷπʔϧ͕ू໿

ͳͥॻ͘ͷ͔ɿ ৺Λແʹͯ͠ॻ͘ͷʹௐ౓ྑ͍͔Β ॆ࣮ͨ͠πʔϧ܈ʹΑΔαϙʔτɻ ੩తܕ෇͚ͳμοΫλΠϐϯάͰ໘౗͘͘͞ͳ͍ɻ ίϯύΠϧ࣌ʹܕνΣοΫͯ͠΄͍͚͠Ͳɺؾ࣋ͪ͸--࢖͍Ͱ͍͍ͨ goίϚϯυʹϏϧυɾςετɾίʔυ੔ܗɾੜ੒ͳͲͷπʔϧ͕ू໿

ͳͥॻ͘ͷ͔ɿ ৺Λແʹͯ͠ॻ͘ͷʹௐ౓ྑ͍͔Β ॆ࣮ͨ͠πʔϧ܈ʹΑΔαϙʔτɻ ੩తܕ෇͚ͳμοΫλΠϐϯάͰ໘౗͘͘͞ͳ͍ɻ ࠇຐज़͕ͳ͍ɻݟͨ໨ͦͷ··ʹಈ͘ɻ ίϯύΠϧ࣌ʹܕνΣοΫͯ͠΄͍͚͠Ͳɺؾ࣋ͪ͸--࢖͍Ͱ͍͍ͨ ҉໧తܕม׵ͱ͔ϚΫϩͱ͔ڧྗ͚ͩͲɺͦΕΑΓ͸ಡΈ΍͢͞ॏࢹ goίϚϯυʹϏϧυɾςετɾίʔυ੔ܗɾੜ੒ͳͲͷπʔϧ͕ू໿

ࢲͷ৔߹ɿPython͔ΒGolang΁

ࢲͷ৔߹ɿPython͔ΒGolang΁ Python͸ྑ͍ͷ͕ͩʜ

ࢲͷ৔߹ɿPython͔ΒGolang΁ ɾ੩తܕνΣοΫ͍ͨ͠ Python͸ྑ͍ͷ͕ͩʜ

ࢲͷ৔߹ɿPython͔ΒGolang΁ ɾ੩తܕνΣοΫ͍ͨ͠ ɾ͋Δఔ౓ߴ଎ʹಈ͔͍ͨ͠ Python͸ྑ͍ͷ͕ͩʜ

ࢲͷ৔߹ɿPython͔ΒGolang΁ ɾ੩తܕνΣοΫ͍ͨ͠ ɾ͋Δఔ౓ߴ଎ʹಈ͔͍ͨ͠ ɾฒߦॲཧɾฒྻॲཧΛָʹॻ͖͍ͨ Python͸ྑ͍ͷ͕ͩʜ

ࢲͷ৔߹ɿPython͔ΒGolang΁ ɾ੩తܕνΣοΫ͍ͨ͠ ɾ͋Δఔ౓ߴ଎ʹಈ͔͍ͨ͠ ɾฒߦॲཧɾฒྻॲཧΛָʹॻ͖͍ͨ ɾ͚ͲɺίϯύΠϧ΍ϏϧυπʔϧͰਏ͘ͳΓͨ͘ͳ͍ Python͸ྑ͍ͷ͕ͩʜ

ࢲͷ৔߹ɿPython͔ΒGolang΁ ɾ੩తܕνΣοΫ͍ͨ͠ ɾ͋Δఔ౓ߴ଎ʹಈ͔͍ͨ͠ ɾฒߦॲཧɾฒྻॲཧΛָʹॻ͖͍ͨ ɾ͚ͲɺίϯύΠϧ΍ϏϧυπʔϧͰਏ͘ͳΓͨ͘ͳ͍ ͦΕɺGolangͰͰ͖ΔΑʂ Python͸ྑ͍ͷ͕ͩʜ

୯७Ͱ෼͔Γ΍͍͢πʔϧ܈

HPSVOͱΓ͋͑ͣίϯύΠϧ࣮ͯ͠ߦ͢Δ

HPSVOͱΓ͋͑ͣίϯύΠϧ࣮ͯ͠ߦ͢Δ 1 package main 2 3 import ( 4 "fmt"
5 ) 6 7 func main() { 8 fmt.Println("Hello, world!") 9 } ίϯύΠϧɾ࣮ߦΛ͓͜ͳ͏ɻ ɾίϯύΠϧ͸ߴ଎ ɾ͍ΘΏΔ--తͳؾ࣋ͪͰ࣮ߦ

5 ) 6 7 func main() { 8 fmt.Println("Hello, world!") 9 } $ go run main.go ίϯύΠϧɾ࣮ߦΛ͓͜ͳ͏ɻ ɾίϯύΠϧ͸ߴ଎ ɾ͍ΘΏΔ--తͳؾ࣋ͪͰ࣮ߦ

5 ) 6 7 func main() { 8 fmt.Println("Hello, world!") 9 } $ go run main.go ίϯύΠϧɾ࣮ߦΛ͓͜ͳ͏ɻ ɾίϯύΠϧ͸ߴ଎ ɾ͍ΘΏΔ--తͳؾ࣋ͪͰ࣮ߦ ʮͱΓ࣮͋͑ͣߦʯ͕ؾܰʹͰ͖Δ $ go run main.go Hello, world!

5 ) 6 7 func main() { 8 fmt.Println("Hello, world!") 9 } $ go run main.go $ go run main.go Hello, world! ίϯύΠϧɾ࣮ߦΛ͓͜ͳ͏ɻ ɾίϯύΠϧ͸ߴ଎ ɾ͍ΘΏΔ--తͳؾ࣋ͪͰ࣮ߦ ։ൃऀͰ͋ΔRob Pikeࢯ͍Θ͘ʮಛผ଎͍Θ͚Ͱ͸ͳ͍ɻ஗͘ͳΔ͜ͱΛ΍ͬͯͳ͍͚ͩɻʯͱͷ͜ͱ ʮͱΓ࣮͋͑ͣߦʯ͕ؾܰʹͰ͖Δ https://twitter.com/Morikuma_Works/status/538961275779162112

HPGNUίʔυΛ੔͑Δ

HPGNUίʔυΛ੔͑Δ ίʔυϑΥʔϚολʔ͕ެࣜʹఏڙ͞Ε͍ͯΔɻ

HPGNUίʔυΛ੔͑Δ ίʔυϑΥʔϚολʔ͕ެࣜʹఏڙ͞Ε͍ͯΔɻ ɾελΠϧͷ౷Ұͱ͍͏ ॏཁ͚ͩͲ ෆໟͳٞ࿦͕ى͖ͳ͍ɻ

HPGNUίʔυΛ੔͑Δ ίʔυϑΥʔϚολʔ͕ެࣜʹఏڙ͞Ε͍ͯΔɻ ɾελΠϧͷ౷Ұͱ͍͏ ॏཁ͚ͩͲ ෆໟͳٞ࿦͕ى͖ͳ͍ɻ ɾίʔυΛॻ͘͜ͱʹूதͰ͖Δɻอଘ࣌ʹࣗಈͰϑΥʔϚοτɻ

HPGNUίʔυΛ੔͑Δ 1 package main 2 3 4 import ( 5
"fmt" 6 ) 7 8 func main(){ 9 fmt.Println( "Hello, world!") } ίʔυϑΥʔϚολʔ͕ެࣜʹఏڙ͞Ε͍ͯΔɻ ɾελΠϧͷ౷Ұͱ͍͏ ॏཁ͚ͩͲ ෆໟͳٞ࿦͕ى͖ͳ͍ɻ ɾίʔυΛॻ͘͜ͱʹूதͰ͖Δɻอଘ࣌ʹࣗಈͰϑΥʔϚοτɻ

"fmt" 6 ) 7 8 func main(){ 9 fmt.Println( "Hello, world!") } ίʔυϑΥʔϚολʔ͕ެࣜʹఏڙ͞Ε͍ͯΔɻ $ go fmt main.go ɾελΠϧͷ౷Ұͱ͍͏ ॏཁ͚ͩͲ ෆໟͳٞ࿦͕ى͖ͳ͍ɻ ɾίʔυΛॻ͘͜ͱʹूதͰ͖Δɻอଘ࣌ʹࣗಈͰϑΥʔϚοτɻ

"fmt" 6 ) 7 8 func main(){ 9 fmt.Println( "Hello, world!") } 1 package main 2 3 import ( 4 "fmt" 5 ) 6 7 func main() { 8 fmt.Println("Hello, world!") 9 } ίʔυϑΥʔϚολʔ͕ެࣜʹఏڙ͞Ε͍ͯΔɻ $ go fmt main.go ɾελΠϧͷ౷Ұͱ͍͏ ॏཁ͚ͩͲ ෆໟͳٞ࿦͕ى͖ͳ͍ɻ ɾίʔυΛॻ͘͜ͱʹूதͰ͖Δɻอଘ࣌ʹࣗಈͰϑΥʔϚοτɻ

HPHFUύοέʔδΛऔಘͯ͠Πϯετʔϧ

HPHFUύοέʔδΛऔಘͯ͠Πϯετʔϧ $ go get -u github.com/mitsuse/bullet ύοέʔδ໊Λࢦఆ͢Δ͚ͩʂϏϧυ͔ΒΠϯετʔϧ·Ͱ׬ྃ͢Δɻ

HPHFUύοέʔδΛऔಘͯ͠Πϯετʔϧ $ go get -u github.com/mitsuse/bullet ύοέʔδ໊Λࢦఆ͢Δ͚ͩʂϏϧυ͔ΒΠϯετʔϧ·Ͱ׬ྃ͢Δɻ Makefile૬౰ϑΝΠϧ΍ґଘؔ܎Λఆٛ͢ΔϑΝΠϧ͕ଘࡏ͠ͳ͍ɻ

HPHFUύοέʔδΛऔಘͯ͠Πϯετʔϧ $ go get -u github.com/mitsuse/bullet ύοέʔδ໊Λࢦఆ͢Δ͚ͩʂϏϧυ͔ΒΠϯετʔϧ·Ͱ׬ྃ͢Δɻ 1 import (
2 ... 3 "github.com/codegangsta/cli" 4 "github.com/mitsuse/pushbullet-go" 5 "github.com/mitsuse/pushbullet-go/requests" 6 ) Makefile૬౰ϑΝΠϧ΍ґଘؔ܎Λఆٛ͢ΔϑΝΠϧ͕ଘࡏ͠ͳ͍ɻ

HPHFUύοέʔδΛऔಘͯ͠Πϯετʔϧ $ go get -u github.com/mitsuse/bullet ύοέʔδ໊Λࢦఆ͢Δ͚ͩʂϏϧυ͔ΒΠϯετʔϧ·Ͱ׬ྃ͢Δɻ 1 import (
2 ... 3 "github.com/codegangsta/cli" 4 "github.com/mitsuse/pushbullet-go" 5 "github.com/mitsuse/pushbullet-go/requests" 6 ) import͞ΕͯΔύοέʔδ΋औಘɾϏϧυ Makefile૬౰ϑΝΠϧ΍ґଘؔ܎Λఆٛ͢ΔϑΝΠϧ͕ଘࡏ͠ͳ͍ɻ

HPHFUύοέʔδΛऔಘͯ͠Πϯετʔϧ $ go get -u github.com/mitsuse/bullet ύοέʔδ໊Λࢦఆ͢Δ͚ͩʂϏϧυ͔ΒΠϯετʔϧ·Ͱ׬ྃ͢Δɻ ґଘؔ܎ͷ؅ཧ͸ɺίʔυதͷimport͕݉Ͷ͍ͯΔɻແବ͕ͳ͍ɻ 1 import
( 2 ... 3 "github.com/codegangsta/cli" 4 "github.com/mitsuse/pushbullet-go" 5 "github.com/mitsuse/pushbullet-go/requests" 6 ) import͞ΕͯΔύοέʔδ΋औಘɾϏϧυ Makefile૬౰ϑΝΠϧ΍ґଘؔ܎Λఆٛ͢ΔϑΝΠϧ͕ଘࡏ͠ͳ͍ɻ

ܕγεςϜ͕୯७ ܕʹ֊૚ؔ܎͕ͳ͍

ߏ଄ମ(struct)ɿ Goͷߏ଄ମ͸ϝιουΛ࣋ͭ

ߏ଄ମ(struct)ɿ Goͷߏ଄ମ͸ϝιουΛ࣋ͭ 1 package main 2 3 import ( 4
"fmt" 5 ) 6 7 type Cat struct { 8 name string 9 } 10 11 func (c *Cat) Name() string { 12 return c.name 13 } 14 15 func main() { 16 cat := &Cat{ 17 name: "Rentaro", 18 } 19 20 fmt.Println(cat.Name()) 21 } ߏ଄ମͷΠϯελϯε͔Βυοτ෇͖Ͱϝιουݺͼग़͕͠Մೳɻ

"fmt" 5 ) 6 7 type Cat struct { 8 name string 9 } 10 11 func (c *Cat) Name() string { 12 return c.name 13 } 14 15 func main() { 16 cat := &Cat{ 17 name: "Rentaro", 18 } 19 20 fmt.Println(cat.Name()) 21 } ߏ଄ମͱϑΟʔϧυ ߏ଄ମͷΠϯελϯε͔Βυοτ෇͖Ͱϝιουݺͼग़͕͠Մೳɻ

"fmt" 5 ) 6 7 type Cat struct { 8 name string 9 } 10 11 func (c *Cat) Name() string { 12 return c.name 13 } 14 15 func main() { 16 cat := &Cat{ 17 name: "Rentaro", 18 } 19 20 fmt.Println(cat.Name()) 21 } ߏ଄ମͱϑΟʔϧυ ߏ଄ମ͸ϝιουΛ࣋ͭ ߏ଄ମͷΠϯελϯε͔Βυοτ෇͖Ͱϝιουݺͼग़͕͠Մೳɻ

"fmt" 5 ) 6 7 type Cat struct { 8 name string 9 } 10 11 func (c *Cat) Name() string { 12 return c.name 13 } 14 15 func main() { 16 cat := &Cat{ 17 name: "Rentaro", 18 } 19 20 fmt.Println(cat.Name()) 21 } ߏ଄ମͱϑΟʔϧυ ߏ଄ମ͸ϝιουΛ࣋ͭ {}͔newͰੜ੒ɾॳظԽ ߏ଄ମͷΠϯελϯε͔Βυοτ෇͖Ͱϝιουݺͼग़͕͠Մೳɻ

ΠϯλʔϑΣʔε (interface)ɿ ϝιουఆٛͷू·Γ

ΠϯλʔϑΣʔε (interface)ɿ ϝιουఆٛͷू·Γ 1 type Named interface { 2 Name()
string 3 } 4 5 type Cat struct { 6 name string 7 } 8 9 func (c *Cat) Name() string { 10 return c.name 11 } .. 21 func printName(n Named) { 22 fmt.Println(n.Name()) 23 } ΠϯλʔϑΣʔεͰϝιουͷγάωνϟΛఆٛ͢Δɻ

string 3 } 4 5 type Cat struct { 6 name string 7 } 8 9 func (c *Cat) Name() string { 10 return c.name 11 } .. 21 func printName(n Named) { 22 fmt.Println(n.Name()) 23 } ΠϯλʔϑΣʔε͸ϝιου܈Λఆٛ ΠϯλʔϑΣʔεͰϝιουͷγάωνϟΛఆٛ͢Δɻ

string 3 } 4 5 type Cat struct { 6 name string 7 } 8 9 func (c *Cat) Name() string { 10 return c.name 11 } .. 21 func printName(n Named) { 22 fmt.Println(n.Name()) 23 } ΠϯλʔϑΣʔε͸ϝιου܈Λఆٛ *Cat͸Name()ϝιουΛ࣋ͭ ΠϯλʔϑΣʔεͰϝιουͷγάωνϟΛఆٛ͢Δɻ

string 3 } 4 5 type Cat struct { 6 name string 7 } 8 9 func (c *Cat) Name() string { 10 return c.name 11 } .. 21 func printName(n Named) { 22 fmt.Println(n.Name()) 23 } ΠϯλʔϑΣʔε͸ϝιου܈Λఆٛ *Cat͸Name()ϝιουΛ࣋ͭ *Cat͸NamedΛຬ͍ͨͯ͠Δ ΠϯλʔϑΣʔεͰϝιουͷγάωνϟΛఆٛ͢Δɻ

string 3 } 4 5 type Cat struct { 6 name string 7 } 8 9 func (c *Cat) Name() string { 10 return c.name 11 } .. 21 func printName(n Named) { 22 fmt.Println(n.Name()) 23 } ΠϯλʔϑΣʔε͸ϝιου܈Λఆٛ ΠϯλʔϑΣʔεͰϝιουͷγάωνϟΛఆٛ͢Δɻ ΠϯλʔϑΣʔε͕࣋ͭϝιου܈ͷ࣮૷Λɺߏ଄ମ͕͍࣋ͬͯΔɻ ߏ଄ମ͸ɺͦͷΠϯλʔϑΣʔεܕͱͯ͠ར༻Ͱ͖Δɻ ࣮૷ͯ͠Δ͜ͱΛ໌ࣔ͠ͳͯ͘ྑ͍ɻ੩తͳμοΫλΠϐϯάɻ *Cat͸Name()ϝιουΛ࣋ͭ *Cat͸NamedΛຬ͍ͨͯ͠Δ

ߏ଄ମຒΊࠐΈ (struct embedding)ɿ ҠৡʹΑΔΠϯλʔϑΣʔεͷ࣮૷ύλʔϯ

ߏ଄ମຒΊࠐΈ (struct embedding)ɿ ҠৡʹΑΔΠϯλʔϑΣʔεͷ࣮૷ύλʔϯ 1 type Named interface { 2
Name() string 3 } 4 5 type Animal struct { 6 name string 7 } 8 9 func (a *Animal) Name() string { 10 return a.name 11 } 12 13 type Cat struct { 14 *Animal 15 } Golangʹ͸ܧঝ͸ͳ͍ɻ ߏ଄ମຒΊࠐΈͰҠৡͯ͠ɺΠϯλʔ ϑΣʔεΛຬͨ͢ύλʔϯɻ

Name() string 3 } 4 5 type Animal struct { 6 name string 7 } 8 9 func (a *Animal) Name() string { 10 return a.name 11 } 12 13 type Cat struct { 14 *Animal 15 } *Animal͸Name()ϝιουΛ࣋ͭ ߏ଄ମຒΊࠐΈͰҠৡͯ͠ɺΠϯλʔ ϑΣʔεΛຬͨ͢ύλʔϯɻ Golangʹ͸ܧঝ͸ͳ͍ɻ

Name() string 3 } 4 5 type Animal struct { 6 name string 7 } 8 9 func (a *Animal) Name() string { 10 return a.name 11 } 12 13 type Cat struct { 14 *Animal 15 } ಗ໊ϑΟʔϧυ*Animalͷϝιου͸ɺ *Catͷॴ༗෺ͷΑ͏ʹΞΫηεͰ͖Δ ߏ଄ମຒΊࠐΈͰҠৡͯ͠ɺΠϯλʔ ϑΣʔεΛຬͨ͢ύλʔϯɻ Golangʹ͸ܧঝ͸ͳ͍ɻ *Animal͸Name()ϝιουΛ࣋ͭ

Name() string 3 } 4 5 type Animal struct { 6 name string 7 } 8 9 func (a *Animal) Name() string { 10 return a.name 11 } 12 13 type Cat struct { 14 *Animal 15 } ߏ଄ମຒΊࠐΈͰҠৡͯ͠ɺΠϯλʔ ϑΣʔεΛຬͨ͢ύλʔϯɻ ܕʹ֊૚ؔ܎͕ͳ͍ɻΠϯλʔϑΣʔεΛຬ͍ͨͯ͠Δ͔͕ॏཁɻ Golangʹ͸ܧঝ͸ͳ͍ɻ ಗ໊ϑΟʔϧυ*Animalͷϝιου͸ɺ *Catͷॴ༗෺ͷΑ͏ʹΞΫηεͰ͖Δ *Animal͸Name()ϝιουΛ࣋ͭ

഑෍ํ๏͕୯७

୯ҰόΠφϦɾΫϩείϯύΠϧͰ഑෍͠΍͍͢

୯ҰόΠφϦɾΫϩείϯύΠϧͰ഑෍͠΍͍͢ ࣮ߦՄೳϑΝΠϧ͸ɺ୯ҰͷϑΝΠϧʹ·ͱΊΒΕΔɻ ɾجຊతʹ͸ੜ੒͞ΕͨόΠφϦΛ഑෍͢Ε͹ྑ͍ɻ

୯ҰόΠφϦɾΫϩείϯύΠϧͰ഑෍͠΍͍͢ ࣮ߦՄೳϑΝΠϧ͸ɺ୯ҰͷϑΝΠϧʹ·ͱΊΒΕΔɻ ɾجຊతʹ͸ੜ੒͞ΕͨόΠφϦΛ഑෍͢Ε͹ྑ͍ɻ ؀ڥม਺ͰOSͱΞʔΩςΫνϟΛࢦఆ͢Δ͚ͩɻ

୯ҰόΠφϦɾΫϩείϯύΠϧͰ഑෍͠΍͍͢ $ GOOS=windows GOARCH=amd64 go build main.go ؀ڥม਺ͰOSͱΞʔΩςΫνϟΛࢦఆ͢Δ͚ͩɻ ྫ͑͹ɺOS X্ͰɺWindowsόΠφϦΛग़ྗ͢Δɻ
࣮ߦՄೳϑΝΠϧ͸ɺ୯ҰͷϑΝΠϧʹ·ͱΊΒΕΔɻ ɾجຊతʹ͸ੜ੒͞ΕͨόΠφϦΛ഑෍͢Ε͹ྑ͍ɻ

୯ҰόΠφϦɾΫϩείϯύΠϧͰ഑෍͠΍͍͢ ྫ͑͹ɺOS X্ͰɺWindowsόΠφϦΛग़ྗ͢Δɻ ࣮ߦՄೳϑΝΠϧ͸ɺ୯ҰͷϑΝΠϧʹ·ͱΊΒΕΔɻ ɾجຊతʹ͸ੜ੒͞ΕͨόΠφϦΛ഑෍͢Ε͹ྑ͍ɻ ͦΕͧΕͷ؀ڥ޲͚ʹΫϩείϯύΠϧͯ͠όΠφϦΛҰͭ഑෍ͰOK ؀ڥม਺ͰOSͱΞʔΩςΫνϟΛࢦఆ͢Δ͚ͩɻ $ GOOS=windows GOARCH=amd64
go build main.go

Մಡੑ͸େ੾

“No magic”Ͱ͋Δ

“No magic”Ͱ͋Δ ͍ΘΏΔʮࠇຐज़ʯతͳػೳ͸࣮૷͞Εͳ͍

“No magic”Ͱ͋Δ ɾ҉໧తܕม׵ ɾϚΫϩ ɾ҉໧తͳύϥϝʔλʔ ͍ΘΏΔʮࠇຐज़ʯతͳػೳ͸࣮૷͞Εͳ͍

“No magic”Ͱ͋Δ ɾ҉໧తܕม׵ ɾϚΫϩ ɾ҉໧తͳύϥϝʔλʔ ͍ΘΏΔʮࠇຐज़ʯతͳػೳ͸࣮૷͞Εͳ͍ ʮࠇຐज़ʯ͸ڧྗ͚ͩͲɺద੾ʹ࢖͏ͷ͕೉͍͠ɻ

“No magic”Ͱ͋Δ ɾ҉໧తܕม׵ ɾϚΫϩ ɾ҉໧తͳύϥϝʔλʔ ͍ΘΏΔʮࠇຐज़ʯతͳػೳ͸࣮૷͞Εͳ͍ ίʔυ͕ݟͨ໨ͦͷ··ʹ࣮ߦ͞ΕΔ͜ͱ͕ॏࢹ͞ΕΔɻ ʮࠇຐज़ʯ͸ڧྗ͚ͩͲɺద੾ʹ࢖͏ͷ͕೉͍͠ɻ

“No magic”Ͱ͋Δ ɾ҉໧తܕม׵ ɾϚΫϩ ɾ҉໧తͳύϥϝʔλʔ ͍ΘΏΔʮࠇຐज़ʯతͳػೳ͸࣮૷͞Εͳ͍ ίʔυ͕ݟͨ໨ͦͷ··ʹ࣮ߦ͞ΕΔ͜ͱ͕ॏࢹ͞ΕΔɻ ʮࠇຐज़ʯ͸ڧྗ͚ͩͲɺద੾ʹ࢖͏ͷ͕೉͍͠ɻ ෳࡶͳػೳΛͱΓ͜·ͳ͍͜ͱͰݴޠͦͷ΋ͷΛγϯϓϧʹอͭɻ

“No magic”Ͱ͋Δ ɾ҉໧తܕม׵ ɾϚΫϩ ɾ҉໧తͳύϥϝʔλʔ ͍ΘΏΔʮࠇຐज़ʯతͳػೳ͸࣮૷͞Εͳ͍ ίʔυ͕ݟͨ໨ͦͷ··ʹ࣮ߦ͞ΕΔ͜ͱ͕ॏࢹ͞ΕΔɻ ʮࠇຐज़ʯ͸ڧྗ͚ͩͲɺద੾ʹ࢖͏ͷ͕೉͍͠ɻ ෳࡶͳػೳΛͱΓ͜·ͳ͍͜ͱͰݴޠͦͷ΋ͷΛγϯϓϧʹอͭɻ ࠇຐज़͕ೖΔ༨஍͕গͳ͍ͷͰՄಡੑͱ৴པੑ͕ҡ࣋͞Ε΍͍͢

خ͘͠ͳ͍ͱ͜Ζ

خ͘͠ͳ͍ͱ͜Ζɿ  δΣωϦΫε͕ͳ͍ɾόʔδϣϯݻఆ͕ਏ͍

خ͘͠ͳ͍ͱ͜Ζɿ  δΣωϦΫε͕ͳ͍ɾόʔδϣϯݻఆ͕ਏ͍ ɾΠϯλʔϑΣʔεͰ·͔ͳ͑Δέʔε΋ଟ͍͕ɺ೉͍͠৔໘΋ɻ ɾӬٱʹ࣮૷͞Εͳ͍Θ͚Ͱ͸ͳ͍͕ɺޓ׵ੑ্͠͹Β͘͸ͳ͍͔΋ʁ ɾந৅౓ͷߴ͍΋ͷΛॻ͘ͷ͸ਏ͍ɻΉ͠Ζॻ͘΂͖Ͱ͸ͳ͍ɻ δΣωϦΫε૬౰ͷ΋ͷ͸ͳ͍

خ͘͠ͳ͍ͱ͜Ζɿ  δΣωϦΫε͕ͳ͍ɾόʔδϣϯݻఆ͕ਏ͍ ɾݱঢ়ެࣜͰ͸ɺϥΠϒϥϦͷόʔδϣϯΛݻఆ͢Δखஈ͸ͳ͍ɻ ɾgodepͱ͔gopkg.inͱ͔࢖͑͹Ͱ͖Δ͚Ͳɻ ɾGo 1.5Ҏ߱Ͱͪΐͬͱঢ়گมΘΔ͔΋ʁ ɾΠϯλʔϑΣʔεͰ·͔ͳ͑Δέʔε΋ଟ͍͕ɺ೉͍͠৔໘΋ɻ δΣωϦΫε૬౰ͷ΋ͷ͸ͳ͍ ϥΠϒϥϦͷόʔδϣϯͷݻఆ͕೉͍͠ ɾӬٱʹ࣮૷͞Εͳ͍Θ͚Ͱ͸ͳ͍͕ɺޓ׵ੑ্͠͹Β͘͸ͳ͍͔΋ʁ
ɾந৅౓ͷߴ͍΋ͷΛॻ͘ͷ͸ਏ͍ɻΉ͠Ζॻ͘΂͖Ͱ͸ͳ͍ɻ

Ұ൪େ੾ͳ͜ͱ

Gopher͸͔Θ͍͍

·ͱΊɿπʔϧͱࢥ૝Ͱ৺ΛແʹͰ͖Δݴޠ ॆ࣮ͨ͠πʔϧ܈ʹΑΔαϙʔτɻ ੩తܕ෇͚ͳμοΫλΠϐϯάͰ໘౗͘͘͞ͳ͍ɻ ࠇຐज़͕ͳ͍ɻݟͨ໨ͦͷ··ʹಈ͘ɻ goίϚϯυʹϏϧυɾςετɾίʔυ੔ܗɾੜ੒ͳͲͷπʔϧ͕ू໿ ίϯύΠϧ࣌ʹܕνΣοΫͯ͠΄͍͚͠Ͳɺؾ࣋ͪ͸--࢖͍Ͱ͍͍ͨ ҉໧తܕม׵ͱ͔ϚΫϩͱ͔ڧྗ͚ͩͲɺͦΕΑΓ͸ಡΈ΍͢͞ॏࢹ

Golang で心を無にしてコードを書く

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