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at Student Go #1
ΓԶͷ Go ΞϓϦέʔγϣϯઃܭ
·͕͍ͪͬͯΔɻ
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LUS !LUS@!LUS
6OJWFSTJUZPG"J[V
XIPBNJ
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w (Pͷࢥͱඪ४ύοέʔδͷಛ
w (PΞϓϦέʔγϣϯͷઃܭ
ࠓ͓͢Δ͜ͱ
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w Զͷߟ͑ͨ࠷ڧͷΞʔΩςΫνϟ
w ΞϓϦέʔγϣϯ֎෦ͷ͜ͱ %#ɺ8FCαʔόɺ
FUD
ࠓ͓͠ͳ͍͜ͱ
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w ͳͥઃܭΛ͢Δͷ͔ʁ
w ΦϒδΣΫτࢦͱϞδϡʔϧ
w (Pͷࢥͱύοέʔδઃܭ
w (PΞϓϦέʔγϣϯઃܭ
ΞδΣϯμ
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w ͳͥઃܭΛ͢Δͷ͔ʁ
w ΦϒδΣΫτࢦͱϞδϡʔϧ
w (Pͷࢥͱύοέʔδઃܭ
w (PΞϓϦέʔγϣϯઃܭ
ΞδΣϯμ
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ͳͥઃܭΛ͢Δͷ͔ʁ
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w ਓؒඞͣؒҧ͑Δ
w Ϧιʔεৗʹ༗ݶ
ιϑτΣΞਓ͕͍ؒͭͬͯ͘Δ
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w ఆ֎ͷৼΔ͍ όά
ͷίετΛ࠷খݶʹ
w मਖ਼ͷίετΛ࠷খݶʹ
ݶΒΕͨϦιʔεͰιϑτΣΞΛ
ͭ͘ΔͨΊʹ
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w Ϗδωεʹجͮ͘࡞ۀɾۀɾࣄ υϝΠϯ
ΛࣗಈԽ͢Δͷ͕ΞϓϦέʔγϣϯ։ൃ
w ͜ΕΒৗʹมԽ͠ଓ͚Δ
ΞϓϦέʔγϣϯ։ൃͷδϨϯϚ
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w Ϗδωεʹجͮ͘࡞ۀɾۀɾࣄ υϝΠϯ
ΛࣗಈԽ͢Δͷ͕ΞϓϦέʔγϣϯ։ൃ
w ͜ΕΒৗʹมԽ͠ଓ͚Δ
ΞϓϦέʔγϣϯ։ൃͷδϨϯϚ
ΞϓϦέʔγϣϯΤϯδχΞ
ৗʹมԽ͠ଓ͚ΔͷΛ
͍ଓ͚ͳ͚ΕͳΒͳ͍
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͘ਐΉ།Ұͷํ๏ɺ͏·͘ਐΉ͜ͱͰ͋Δɻ
— Clean Architecture ୡਓʹֶͿιϑτΣΞͷߏͱઃܭ
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w ༷௨Γʹಈ࡞͢Δ͔
w ༷มߋʹదԠͰ͖Δ͔
w ιϑτΣΞͷ࠶ར༻ੑ
w FUD
ιϑτΣΞʹٻΊΔ͜ͱ
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w ίʔυͷมߋ͢͠͞
w ίʔυͷཧղ͢͠͞ɺՄಡੑ
w FUD
ͦͷͨΊʹඞཁͳͷ
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w ։ൃऀ͕υϝΠϯϩδοΫʹूதͰ͖Δ
w ਖ਼ղͰͳ͘ͱܾΊΔ͜ͱࣗମʹՁ͕͋Δ
ઃܭɾΞʔΩςΫνϟͷՁ
*1: https://speakerdeck.com/sonatard/next-currency-gaego
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w ͳͥઃܭΛ͢Δͷ͔ʁ
w ΦϒδΣΫτࢦͱϞδϡʔϧ
w (Pͷࢥͱύοέʔδઃܭ
w (PΞϓϦέʔγϣϯઃܭ
ΞδΣϯμ
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ΦϒδΣΫτࢦͱϞδϡʔϧ
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ΦϒδΣΫτࢦΫϥεࢦ
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w :FTBOEOP
w $ݴޠΑΓΦϒδΣΫτࢦͳݴޠ
w ΦϒδΣΫτࢦ͔Ͳ͏͔ਅِͰͳ͍
(PΦϒδΣΫτࢦݴޠ͔ʁ
*1: https://golang.org/doc/faq#Is_Go_an_object-oriented_language
*2: ΦϒδΣΫτࢦೖ ୈ 2 ൛ ݪଇɾίϯηϓτ
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w ιϑτΣΞͷ͖࣋ͭػೳͷ༷ඇৗʹ੬͍
w ৗʹιϑτΣΞશମ͕มߋ͞ΕΔՄೳੑ͕
͖·ͱ͏
ػೳϕʔεͷϞσϦϯά
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ྫ
ίϯύΠϥ
w MFYFS
w QBSTFS
w "45
ΦϒδΣΫτϕʔεͷϞσϦϯά
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ίϯύΠϥʹ৽͍͠ػೳ͕Ճ͞Εͨͱͯ͠
ΦϒδΣΫτʹมߋੜ͡ʹ͍͘
ΦϒδΣΫτϕʔεͷϞσϦϯά
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ιϑτΣΞͷ͖࣋ͭػೳͰͳ͘ɺ
ૢ࡞͢ΔΦϒδΣΫτͷܕ͔Βಋ͔ΕΔϞδϡʔϧ
ΛجຊʹΞʔΩςΫνϟΛߏங͢Δ։ൃख๏
ΦϒδΣΫτࢦʹΑΔ։ൃ
— ΦϒδΣΫτࢦೖ ୈ 2 ൛ ݪଇɾίϯηϓτ (Ұ෦վม)
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ιϑτΣΞͷ͖࣋ͭػೳͰͳ͘ɺ
ૢ࡞͢ΔΦϒδΣΫτͷܕ͔Βಋ͔ΕΔϞδϡʔϧ
ΛجຊʹΞʔΩςΫνϟΛߏங͢Δ։ൃख๏
ΦϒδΣΫτࢦʹΑΔ։ൃ
— ΦϒδΣΫτࢦೖ ୈ 2 ൛ ݪଇɾίϯηϓτ (Ұ෦վม)
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w /P
w ػೳΛΒͳ͚ΕιϑτΣΞΛߏஙͰ͖ͳ͍
w ػೳΑΓઌʹΦϒδΣΫτͷܕΛੳ͢Δ
ػೳʹ͍ͭͯߟ͑Δ͖Ͱͳ͍ʁ
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w QBDLBHF࠷খͷϞδϡʔϧ୯Ґ
w (PNPEVMFTQBDLBHFͷίϨΫγϣϯ୯Ґ
(PͷϞδϡʔϧγεςϜ
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w มߋʹڧ͍ߏΛͭ͘ΔͨΊ
w ཧղ͍͢͠ߏΛͭ͘ΔͨΊ
w Έ߹Θ͍ͤ͢ߏΛͭ͘ΔͨΊ
ͳͥϞδϡʔϧ͕ඞཁ͔ʁ
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w ͳͥઃܭΛ͢Δͷ͔ʁ
w ΦϒδΣΫτࢦͱϞδϡʔϧ
w (Pͷࢥͱύοέʔδઃܭ
w (PΞϓϦέʔγϣϯઃܭ
ΞδΣϯμ
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(Pͷࢥͱύοέʔδߏ
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w l1BDLBHFYYYQSPWJEFT PSJNQMFNFOUT
z͔Β
࢝·ΔυΩϡϝϯτ
ඞ໊ͣࢺ͕ύοέʔδ໊ʹͳΔ
w 4IPSU
DPODJTF
FWPDBUJWF
w "WPJETUVUUFS
w 40-*%ݪଇʹجͮ͘
(Pͷඪ४ύοέʔδͷಛ
*1: https://golang.org/doc/effective_go.html?#package-names
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!IUUQ)5514FSWFS
IUUQ4FSWFS
"WPJETUVUUFS ٣Ի
https://blog.golang.org/package-names
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w 4JOHMF3FTQPOTJCJMJUZ1SJODJQBM
w ϞδϡʔϧͨͬͨҰͭͷΞΫλʔʹରͯ͠
Λෛ͏͖Ͱ͋Δ
4୯Ұݪଇ
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w ύοέʔδ໊͕ද͢υϝΠϯʹͷΈΛ࣋ͭ
w JPˠೖग़ྗΛநԽͨ͠ΠϯλʔϑΣʔεͷఏڙ
w GNUˠೖग़ྗͷϑΥʔϚοτ
4୯Ұݪଇ
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w 0QFO$MPTFE1SJODJQBM
w Ϟδϡʔϧ֦ுʹରͯ͠։͍͍ͯͯɺ
मਖ਼ʹରͯ͠ด͍ͯ͡ͳ͚ΕͳΒͳ͍
0։์ดݪଇ
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type nopCloser struct {
io.Reader
}
func (nopCloser) Close() error { return nil }
func NopCloser(r io.Reader) io.ReadCloser {
return nopCloser{r}
}
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package cli
func Run(cmd string, args []string) {
switch cmd {
case "echo":
fmt.Println(strings.Join(args, " "))
case "reverse":
reversed := reverse(args)
fmt.Println(strings.Join(reversed, " "))
default:
fmt.Println("unknown command")
}
}
$ ./app echo foo bar
foo bar
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package cli
type Command interface {
Run(args []string)
}
func Run(cmd Command, args []string) {
cmd.Run(args)
}
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package main
type echoCommand struct{}
func (c *echoCommand) Run(args []string) {
// logic
}
type reverseCommand struct{}
func (c *reverseCommand) Run(args []string) {
// logic
}
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package main
func main() {
cmdName := os.Args[1]
args := os.Args[2:]
var cmd cli.Command
switch cmdName {
case "echo":
cmd = &echoCommand{}
case "reverse":
cmd = &reverseCommand{}
default:
// unknown command
}
cli.Run(cmd, args)
}
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w ιϑτΣΞ͕બࢶΛఏڙ͠ͳ͚ΕͳΒͳ͍
࣌ɺͨͩҰͭͷϞδϡʔϧ͚͕ͩͦͷબࢶͷ͢
ͯΛѲ͖͢Ͱ͋Δ
୯Ұબ
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package cli
type CLI struct {
Commands map[string]Command
}
func (c *CLI) Run(args []string) error {
cmdName := args[0]
cmd, ok := c.Commands[cmdName]
if !ok {
return errors.New("unknown command")
}
cmd.Run(args[1:])
return nil
}
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package main
func main() {
args := os.Args[1:]
c := &cli.CLI{}
c.Commands = map[string]cli.Command{
“echo": &echoCommand{},
"reverse": &reverseCommand{},
}
c.Run(args)
}
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w 4ܕͷΦϒδΣΫτPͱ5ܕͷΦϒδΣΫτ
P͕͋Γɺ5Λͬͯఆٛ͞ΕͨϓϩάϥϜʹ
ରͯ͠PͷΘΓʹPΛͬͯϓϩάϥϜ
ͷৼΔ͍͕มΘΒͳ͍߹ɺ45ͷੜܕ
ͱݴ͑Δ
-Ϧείϑͷஔݪଇ
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3FDUBOHMF
4RVBSF
$MJFOU
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type Rectangle interface {
SetX(x int)
SetY(y int)
}
type Square struct {
x, y int
}
func (s *Square) SetX(x int) {
s.x, s.y = x, x
}
func (s *Square) SetY(y int) {
s.x, s.y = y, y
}
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func TestRectangle(t *testing.T) {
var r Rectangle = &Square{}
expectedX, expectedY := 100, 200
r.SetX(100)
r.SetY(200)
if x := r.GetX(); x != expectedX {
t.Errorf("x expected %d, but got %d", expectedX, x)
}
if y := r.GetY(); y != expectedY {
t.Errorf("y expected %d, but got %d", expectedX, y)
}
}
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w ΠϯλʔϑΣʔεͷΫϥΠΞϯτʹΫϥΠΞϯτ
͕ར༻͠ͳ͍ϝιουͷґଘΛڧ੍ͯ͠ͳΒ
ͳ͍
*ΠϯλʔϑΣʔεͷݪଇ
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w 5IFCJHHFSUIFJOUFSGBDF
UIFXFBLFSUIF
BCTUSBDUJPO
w ඪ४ύοέʔδͷΠϯλʔϑΣʔεඇৗʹ
খ͘͞ɺগͳ͘อͨΕ͍ͯΔ
*ΠϯλʔϑΣʔεͷݪଇ
*1: Go Proverbs (https://go-proverbs.github.io/)
*2: The Go Blog - Organizing Go code
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w JP3FBEFS
JP8SJUFS
w IUUQ)BOEMFS
w FUD
*ΠϯλʔϑΣʔεͷݪଇ
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w ্ҐϨϕϧͷϞδϡʔϧԼҐϨϕϧͷϞδϡʔϧʹґ
ଘͯ͠ͳΒͳ͍ɻ྆ํͱநʹґଘ͖͢Ͱ͋Δɻ
w நৄࡉʹґଘͯ͠ͳΒͳ͍ɻৄࡉ͕நʹґଘ͢
͖Ͱ͋Δɻ
%ґଘؔٯసͷݪଇ
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w *NQPSUDZDMFOPUBMMPXFE
w ҆ఆͨ͠நґଘάϥϑͷԼҐϨϕϧɺ
ৄࡉ্ҐϨϕϧ
%ґଘؔٯసͷݪଇ
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w ΞʔΩςΫνϟΛઃܭ͠ɺ
w దͳ໊લΛϞδϡʔϧ͚ͭɺ
w ͦΕҎ֎ͷৄࡉυΩϡϝϯτʹ͢
w ݸਓతʹ
࠷कΒΕ͍ͯͳ͍ݪଇͩͱࢥ͏
%FTJHOUIFBSDIJUFDUVSF
OBNFUIFDPNQPOFOUT
EPDVNFOUUIFEFUBJMT
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(PΞϓϦέʔγϣϯͷઃܭ
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w ϥΠϒϥϦͱҧ͍ɺ࣮ߦՄೳϑΝΠϧ
֎෦ʹΫϥΠΞϯτ͕ଘࡏ͢Δ
ϒϥβɺϞόΠϧɺϚΠΫϩαʔϏεɺFUD
w ΫϥΠΞϯτʹఏڙ͢ΔϢʔεέʔε͕ଘࡏ͢Δ
ΞϓϦέʔγϣϯ
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w ϢʔεέʔεϩδοΫ
ϢʔεέʔεΛ࣮ݱ͢ΔͨΊͷϩδοΫ
w υϝΠϯϩδοΫ
Ϣʔεέʔεʹґଘ͠ͳ͍ϩδοΫ
ϢʔεέʔεϩδοΫɺυϝΠϯϩδοΫ
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w 6*"1*ΠϯλʔϑΣʔεʹґଘ͢Δ
w ϖʔδϯά͖ͷҰཡը໘
w ೖྗΛݩʹͨ͠Ϣʔβొ
w FUD
۩ମతͳϢʔεέʔεϩδοΫ
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w Ϣʔεέʔεʹґଘ͠ͳ͍
w υϝΠϯࣝΛϞσϦϯά͠ɺ֤ཁૉΛ
Ϟδϡʔϧ͢Δ
w ৄ͘͠%%%*%%%Λࢀর
υϝΠϯϩδοΫ
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w (Pͷඪ४ύοέʔδͱಉ͡ํͰ
w 40-*%ݪଇΛकΔ
w ໌֬ͳ໊ࢺΛύοέʔδ໊ʹ͢Δ
w ύοέʔδ໊ͱΤϯςΟςΟ໊ΛৗʹηοτͰߟ͑Δ
Ϟδϡʔϧׂͷ୯Ґ
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w ίʔυ͚ͩͰΘ͔Βͳ͍ɺΘ͔ΓͮΒ͍ৄࡉ
༷Λ͢
w ϞδϡʔϧͷΫϥΠΞϯτʹͰ͖ΔݶΓ
࣮Λಡ·ͤͳ͍Α͏ʹ͢Δ
υΩϡϝϯτ
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type ResponseWriter interface {
// WriteHeader sends an HTTP response header with the provided
// status code.
//
// If WriteHeader is not called explicitly, the first call to Write
// will trigger an implicit WriteHeader(http.StatusOK).
// Thus explicit calls to WriteHeader are mainly used to
// send error codes.
//
// The provided code must be a valid HTTP 1xx-5xx status code.
// Only one header may be written. Go does not currently
// support sending user-defined 1xx informational headers,
// with the exception of 100-continue response header that the
// Server sends automatically when the Request.Body is read.
WriteHeader(statusCode int)
}
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type ResponseWriter interface {
// WriteHeader sends an HTTP response header with the provided
// status code.
//
// If WriteHeader is not called explicitly, the first call to Write
// will trigger an implicit WriteHeader(http.StatusOK).
// Thus explicit calls to WriteHeader are mainly used to
// send error codes.
//
// The provided code must be a valid HTTP 1xx-5xx status code.
// Only one header may be written. Go does not currently
// support sending user-defined 1xx informational headers,
// with the exception of 100-continue response header that the
// Server sends automatically when the Request.Body is read.
WriteHeader(statusCode int)
}
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·ͱΊ
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υϝΠϯࣝΛेʹಘΔ
҆ఆͨ͠நΛݟ͚ͭͯɺܕͱ໊લΛ͚ͭΔ
w ΞϓϦέʔγϣϯʹґଘ͠ͳ͍͜ͱ
ಘΒΕͨܕΛ40-*%(Pͷࢥʹج͍ͮͯ
ϞδϡʔϧԽ͢Δ
Ϟδϡʔϧͷఆٛɾߏங
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ػೳ Ϣʔεέʔε
ΛѲ͢Δ
ϞδϡʔϧΛΈ߹Θ࣮ͤͯݱ͢Δ
w ఆٛͨ͠Ϟδϡʔϧʹ࣮͠ͳ͍͜ͱ
ΞϓϦέʔγϣϯͷߏங
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w ͱ͍͑ɺઃܭ͍͠
w ϕετͳઃܭଘࡏ͠ͳ͍
w ঢ়گʹԠͯ͡ϕλʔͳઃܭΛݟ͚͍ͭͯ͜͏
·ͱΊ
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w ΞʔΩςΫνϟύλʔϯɺઃܭͷݪଇ
w ͔ͳΓΘ͔Γ͍͕͢ɺ֤ݪଇͷৄࡉ
ผͷຊͷ΄͏͕ৄ͍͠
$MFBO"SDIJUFDUVSF
ୡਓʹֶͿιϑτΣΞͷߏͱઃܭ
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w ΦϒδΣΫτࢦͷతɺఆٛɺݪଇ
w ϖʔδʂ
w จষ͕ղ͕ͩɺΦϒδΣΫτࢦʹؔ͢Δ
͍͍ͩͨͷ͜ͱॻ͍ͯ͋Δ
ΦϒδΣΫτࢦೖୈ൛
ݪଇɾίϯηϓτ
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w %%%ຊ
w υϝΠϯΛத৺ʹઃܭ͢Δ͜ͱͷॏཁੑཧ
ɺͦͷख๏Λѻ͏
w நతͳදݱ͕ଟ͍ͯ͘͠
ΤϦοΫɾΤϰΝϯεͷυϝΠϯ
ۦಈઃܭ
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w *%%%ຊ
w %%%Λ࣮ࡍͷઃܭʹԠ༻͢Δ
w %%%ຊΛಡΜͰͳ͍ͱΘ͔Βͳ͍͋Δ
࣮ફυϝΠϯۦಈઃܭ
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w 5IF(P#MPHIUUQTCMPHHPMBOHPSH
w 5IF(P1SPHSBNNJOH-BOHVBHF%PDVNFOUBUJPOIUUQTHPMBOHPSHEPD
w 40-*%(P%FTJHOIUUQTEBWFDIFOFZOFUTPMJEHPEFTJHO
w ʮ(PݴޠΒ͠͞ʯͱԿ͔ʁ4JNQMJDJUZͷֶΛཧղ͠ɺ(P8BZʹԊͬͨ։ൃΛ
ਐΊΔ͜ͱͷྑ͞
IUUQTFNQMPZNFOUFOKBQBODPNFOHJOFFSIVCFOUSZ
8FC