1. ãªãGoèšèªãåŠã¶ã®ãïŒ
è¿å¹Žãããã°ã©ãã³ã°èšèªãšãããšPythonãJavaãªã©ãäž»æµã§ãããããããšã¯äžç·ãç»ãæ°ããªèšèªGoèšèªãååšããŸããGoèšèªã¯Googleã«ãã£ãŠéçºãããããã°ã©ãã³ã°èšèªã§ããã®ç¹æ§ãšã¡ãªããããå€ãã®éçºè ãã¡ã®éã§è©±é¡ãšãªã£ãŠããŸãã
1.1 Goèšèªã®ç¹æ§ãšã¡ãªãã
Goèšèªã®ç¹æ§ã¯ã·ã³ãã«ããšé«éæ§ã§ããåŠç¿éå£ãäœããèªã¿ãããæ§æã§èšèšãããŠãããããåå¿è ã§ãã¹ã ãŒãºã«åŠã¶ããšãã§ããŸãããŸããGoèšèªã¯ã³ã³ãã€ã«èšèªã§ãããããPythonãªã©ã®ã€ã³ã¿ãŒããªã¿èšèªãšæ¯èŒããŠå®è¡é床ãéãã§ãã
ããã«ãGoèšèªã¯äžŠè¡åŠçããµããŒãããŠããŸããããã«ãããè€æ°ã®ã¿ã¹ã¯ãåæã«åŠçããããšãå¯èœãšãªãã倧èŠæš¡ãªã·ã¹ãã éçºã«ãé©ããŠããŸãããããã®ç¹åŸŽãGoèšèªã®äž»ãªã¡ãªãããšèšããã§ãããã
1.2 Goèšèªã䜿çšããçç±
ã§ã¯ãå ·äœçã«ãªãGoèšèªãåŠã¶ã¹ããªã®ã§ããããããã®çç±ã¯äž»ã«2ã€ãããŸãã
ãŸããGoèšèªã¯webãµãŒãããããã¯ãŒã¯é¢é£ã®ããŒã«ãåæ£ã·ã¹ãã ãªã©ãéçºããéã«åŒ·åãªããŒã«ãšãªããŸããããã¯ãGoèšèªãé«éãªå®è¡é床ãšäžŠè¡åŠçèœåãæã€ããšããããã€ããã©ãŒãã³ã¹ãªã·ã¹ãã ãæ§ç¯ããã®ã«é©ããŠããããã§ãããŸããã¬ããŒãžã³ã¬ã¯ã·ã§ã³æ©èœããããã¡ã¢ãªç®¡çãèªåã§è¡ã£ãŠãããŸãã
ãããŠãããäžã€ã®çç±ã¯Goèšèªã®å°æ¥æ§ãèŠæ®ãããã®ã§ããGoèšèªã¯Googleã«ãã£ãŠéçºãããã¯ã©ãŠãã€ã³ãã©ã®ããŒã¹ãšãªãDockerãKubernetesçãäžéšã®äž»èŠãªãªãŒãã³ãœãŒã¹ãããžã§ã¯ãã§ã䜿çšããå§ããŠããŸãããããã®ååãããGoèšèªã®éèŠã¯ä»åŸãå¢ããŠããããšãäºæ³ãããŸãã
1.3 Goèšèªã®åžå ŽäŸ¡å€ãšéèŠ
å®éã«ãåäŒæ¥ã§ã®Goèšèªã®æ¡çšç¶æ³ãèŠãŠã¿ããšããã®åžå ŽäŸ¡å€ã®é«ãã䌺ããŸããGoèšèªã¯å€§èŠæš¡ãªããŒã¿åŠçãé«è² è·ãªéä¿¡ãè¡ãã·ã¹ãã ã®éçºã§ç©æ¥µçã«äœ¿çšãããŠãããå€ãã®äŒæ¥ãGoèšèªã®å°å ¥ãæ€èšããŠããŸãã
ãŸããã¹ãã«ãšããŠã®Goèšèªã®éèŠãå¢å ããŠããŸããç¹ã«ãã¯ã©ãŠããµãŒãã¹ããã€ã¯ããµãŒãã¹ã®éçºã«ãããŠã¯ãGoèšèªã®æã€ç¹æ§ãçŽæ¥çã«ããžãã¹äŸ¡å€ãé«ããå¯èœæ§ããããŸããã€ãŸããGoèšèªãç¿åŸããããšã§ãè±å¯ãªãã£ãªã¢ãªãã·ã§ã³ãåºãããšãèšããã§ãããã
2. Goèšèªç¬åŠã®å§ãæ¹
ãŸããGoèšèªãåŠã¶ããã«ã¯ãé©åãªç°å¢ãšããŒã«ãåºç€ç¥èãåŠç¿ãªãœãŒã¹ãå¿ èŠã§ãããããã®åéšåãèŠãŠã¿ãŸãããã
2.1 å¿ èŠãªç°å¢ãšããŒã«
Goèšèªã¯ã¯ãã¹ãã©ãããã©ãŒã ã®æ§è³ªãæã£ãŠããŸããã€ãŸããWindowsãmacOSãLinuxãšãã£ãæ§ã ãªãªãã¬ãŒãã£ã³ã°ã·ã¹ãã ã§åäœããŸããéçºç°å¢ãšããŠã¯ãå ¬åŒã®GoèšèªããŒã«ã»ãããããŠã³ããŒãããããã䜿çšããã®ãäžè¬çã§ããããã«ã¯ã³ã³ãã€ã©ããªã³ã«ãããã±ãŒãžç®¡çããŒã«ãªã©ãGoèšèªã®éçºã«å¿ èŠãªå šãŠã®ããŒã«ãå«ãŸããŠããŸãã
次ã«ãããã¹ããšãã£ã¿ãå¿ èŠã§ããVisual Studio Codeã¯Goèšèªã®ãµããŒããå å®ããŠããããããã°ããŒã«ãå«ãŸããŠãããããåå¿è ã«æé©ã§ããGoLandãšããIDEããããŸããããã¡ãã¯ææã§ãã
ãŸããGoèšèªã¯ã³ã³ãã€ã«èšèªãªã®ã§ãGoã®ãœãŒã¹ã³ãŒããæ©æ¢°èªã«å€æããããã«ã³ã³ãã€ã©ãå¿ èŠãšãªããŸãããã®ã³ã³ãã€ã©ã¯GoããŒã«ã»ããã«å«ãŸããŠããŸãã®ã§ãããã䜿çšããŸãã
2.2 Goèšèªã®åºç€ç¥è
Goèšèªã®åŠç¿ãå§ããåã«ã幟ã€ãã®åºç€ç¥èã«ã€ããŠç解ããŠãããšè¯ãã§ãããããŸãGoèšèªã¯éçåä»ãèšèªã§ãããã³ã³ãã€ã«ãè¡ãåã«ããŒã¿åããã§ãã¯ããŸãããŸããGoèšèªã¯ã¬ããŒãžã³ã¬ã¯ã·ã§ã³ããµããŒãããŠãããã¡ã¢ãªç®¡çãç°¡åã«ããŸããGoèšèªã®ãŠããŒã¯ãªæ©èœãšããŠGoã«ãŒãã³(䞊è¡åŠçããµããŒãããæ©èœ)ããããŸãããããã®ç¥èã¯æ¥ã ã®åŠç¿ãç·Žç¿ãéããŠç解ãæ·±ããŠãããŸãããã
2.3 æçšãªãªãœãŒã¹ãšåèè³æ
ããã°ã©ãã³ã°ãåŠã¶éã«ã¯ãåèã«ãªããªãœãŒã¹ãèŠã€ããããšãéèŠã§ããGoèšèªã®ç¬åŠãå¹ççã«è¡ãããã«ã¯ãå ¬åŒããã¥ã¡ã³ããŒã·ã§ã³ããŸããã§ãã¯ããŸããããããã«ã¯Goèšèªã®è©³çŽ°ãªä»æ§ããã¥ãŒããªã¢ã«ãå«ãŸããŠãããåããŠåŠã¶äººã«ãšã£ãŠå®åº«ãšèšããŸãã
次ã«ããªã³ã©ã€ã³ãã¥ãŒããªã¢ã«ã圹ç«ã¡ãŸãã”A Tour of Go”ã¯å ¬åŒã«æäŸãããŠãããã¥ãŒããªã¢ã«ã§ãåå¿è ã«æé©ã§ããä»ã«ãCodecademyãUdemyçã®åŠç¿ãã©ãããã©ãŒã ã«ãGoèšèªã®ã³ãŒã¹ãçšæãããŠããŸãã
ãŸããGoã«é¢ããæ¬ãè¯ããªãœãŒã¹ãšãªããŸãã”The Go Programming Language”ã”Go in Action”ãšãã£ãæžç±ã¯Goã®è©³çŽ°ãªè§£èª¬ãšå®çšçãªäŸãæäŸããŠãããæ·±ãç解ãåŸãã®ã«åœ¹ç«ã¡ãŸãã
ãããã®ãªãœãŒã¹ãšããŒã«ã掻çšããªãããGoèšèªã®åŠç¿ãé²ããŠãããŸãããã
3. Goèšèªã®åºæ¬æ§æ
Goèšèªã®åŠç¿ãå§ããäžã§ãåºæ¬çãªææ³ã«ã€ããŠç解ããŠããããšã¯éåžžã«éèŠã§ãã以äžã«ãGoèšèªã®åºæ¬çãªææ³ã«ã€ããŠè©³ããã玹ä»ããããŸãã
3.1 å€æ°ãšããŒã¿å
æåã«ãGoèšèªã®å€æ°ãšããŒã¿åã«ã€ããŠèª¬æããŸããå€æ°ãšã¯ãããŒã¿ãæ ŒçŽã§ããç®±ã®ãããªãã®ã§ãããã°ã©ãã³ã°äžã«æ°å€ãããã¹ãããŒã¿ãä»£å ¥ããããèšç®çµæãä¿æãããããããã«äœ¿çšããŸãã
var å€æ°å ããŒã¿å = å€
äžèšããå€æ°ã宣èšããåºæ¬çãªæ§æã§ããå€æ°åã®éšåã«ã¯ä»»æã®ååãã€ããããŒã¿åã®éšåã«ã¯æ ŒçŽãããããŒã¿ã®ã¿ã€ããæå®ããŸããGoèšèªã®äž»èŠãªããŒã¿åã«ã¯ãæŽæ°åïŒintïŒãæµ®åå°æ°ç¹åïŒfloat64ïŒãæåååïŒstringïŒãããŒãªã¢ã³åïŒboolïŒãªã©ããããŸãã
3.2 æŒç®åãšå¶åŸ¡æ§æ
次ã«ãGoèšèªã®æŒç®åãšå¶åŸ¡æ§æã«ã€ããŠèª¬æããŸããæŒç®åãšã¯ã足ãç®ãæãç®ãªã©ã®æ°å€æŒç®ãè¡šçŸããããã®èšå·ã®ããšã§ãGoèšèªã«ã¯ãç®è¡æŒç®åïŒ+ã–ã*ã/ãªã©ïŒãæ¯èŒæŒç®åïŒ==ã!=ã<ã>ãªã©ïŒãè«çæŒç®åïŒ||ïŒORïŒã&&ïŒANDïŒïŒãªã©ããããŸãã
ãŸããå¶åŸ¡æ§æã¯ããã°ã©ã ã®æµããå¶åŸ¡ããããã®æ§æã§ãäž»ã«åå²ïŒifæãswitchæïŒãšç¹°ãè¿ãïŒforæïŒã®2çš®é¡ããããŸããGoèšèªã§ã¯ãJavaScriptãPythonã®ããã«å¶åŸ¡æ§æã®ãããã¯ãè¡šãããã«ã«ãŒãªãã©ã±ããïŒ{ }ïŒã䜿çšããŸãã
äŸãã°ãforæãçšããç¹°ãè¿ãåŠçã¯æ¬¡ã®ããã«èšè¿°ããŸãã
for i := 0; i < 10; i++ { fmt.Println(i) }
ãã®ã³ãŒãã¯ã0ãã9ãŸã§ã®æ°åãé ã«åºåããããã°ã©ã ã§ãã
3.3 é¢æ°ãšããã±ãŒãž
æåŸã«ãGoèšèªã®é¢æ°ãšããã±ãŒãžã«ã€ããŠèª¬æããŸããé¢æ°ãšã¯ãç¹å®ã®åŠçããŸãšãããã®ã§ãåŠçãåå©çšããããšãã§ããŸããGoèšèªã®é¢æ°ã®åºæ¬çãªæ§æã¯ä»¥äžã®ãšããã§ãã
func é¢æ°å(åŒæ° ããŒã¿å) æ»ãå€ã®ããŒã¿å { // åŠç return æ»ãå€ }
ãŸããããã±ãŒãžãšã¯ãé¢æ°ãå€æ°ãªã©ããŸãšããåäœã§ããããã±ãŒãžãå©çšããããšã§ãã³ãŒãã®åå©çšã管çã容æã«ãªããŸããGoèšèªã§ã¯ãèªåã§æ°ãã«ããã±ãŒãžãäœãããšãå¯èœã§ãããæšæºããã±ãŒãžãæäŸããŠããå€åœ©ãªé¢æ°ã䜿ãããšã§ãæ§ã ãªåŠçãå¹ççã«è¡ãããšãã§ããŸããäŸãã°ãæååã®é·ããèšç®ããããã®é¢æ°ãlenãããæšæºåºåãè¡ãããã®ãfmt.Printlnããªã©ãæšæºããã±ãŒãžã«å«ãŸããŠããŸãã
以äžãGoèšèªã®åºæ¬çãªæ§æã«ã€ããŠã®è§£èª¬ã§ãããããã®ç¥èãç解ããŠããã°ãGoèšèªã®ããã°ã©ã ãèªãã ããç°¡åãªããã°ã©ã ãæžãããšãã§ããããã«ãªããŸãã
4. Goèšèªã§ã®ããã°ã©ãã³ã°ã¹ãã«
Goèšèªã®ééå³ãåŒãåºãããã°ã©ãã³ã°ã¹ãã«ã«ã€ããŠè§£èª¬ããŸããããã§åãäžããã®ã¯ããšã©ãŒãã³ããªã³ã°ãšäžŠè¡åŠçæ©èœã§ããGoã«ãŒãã³ãšãã£ãã«ããããŠãã¹ããšãããã°ã«ã€ããŠã§ãã
4.1 ãšã©ãŒãã³ããªã³ã°
ãšã©ãŒãã³ããªã³ã°ã¯ãããã°ã©ã ãäºæãã¬äºæ ã«ééããéã®å¯Ÿå¿æ¹æ³ãå®ããæè¡ã§ããGoèšèªã§ã¯äŸå€åŠçã䜿ããããšã©ãŒãæ瀺çãªå€ãšããŠæ±ããŸããããªãã¡ãé¢æ°ãã¡ãœãããããšã©ãŒæ å ±ãå«ãå€ãè¿ãããããåŒã³åºãå ã§ãã§ãã¯ããã®ãåºæ¬çãªã¹ã¿ã€ã«ãšãªããŸãã
func f() (int, error) {
// ãšã©ãŒãçããå¯èœæ§ãããåŠç
if err := doSomething(); err != nil {
return 0, err
}
return result, nil
}
func main() {
if _, err := f(); err != nil {
fmt.Println(err) // ãšã©ãŒããã³ããªã³ã°
}
}
ãã®ææ³ã¯ããšã©ãŒãç¡èŠãããªã¹ã¯ãæžãããããå ç¢ãªãœãããŠã§ã¢ãæžãããã«åœ¹ç«ã¡ãŸãã
4.2 Goã«ãŒãã³ãšãã£ãã«
Goèšèªã®ç¹åŸŽçãªæ©èœã§ããGoã«ãŒãã³ãšãã£ãã«ã¯ã䞊è¡åŠçã容æã«è¡ãããã®ä»çµã¿ã§ããGoã«ãŒãã³ã¯è»œéãªã¹ã¬ããã§ããããã£ãã«ã¯ãããéã§ã®ã¡ãã»ãŒãžéä¿¡ãè¡ããŸãã
func f(c chan int) {
// ãã£ãã«ã«å€ãéä¿¡
c <- 10
}
func main() {
c := make(chan int)
// goã«ãŒãã³ã®çæ
go f(c)
// ãã£ãã«ããå€ãåä¿¡
i := <-c
fmt.Println(i)
}
ããã«ãããèªã¿ããããç解ãããã䞊è¡åŠçã®ã³ãŒããæžãããšãã§ããŸãã
4.3 ãã¹ããšãããã°
Goèšèªã«ã¯ãã¹ããšãããã°ãæ¯æŽããä»çµã¿ãå å®ããŠããŸããç¹ã«Goèšèªã®æšæºããã±ãŒãžã«ã¯ãtestingãããã±ãŒãžãããããããçšããåäœãã¹ãã容æã«è¡ããŸãã
func TestSum(t *testing.T) {
if sum(1, 2) != 3 {
t.Fail()
}
}
ããã«ããããã¬ãdelveãã䜿çšããããšã§ããã¬ã€ã¯ãã€ã³ããèšå®ãããããã°ãã¹ãããå®è¡ãªã©ãè¡ãããšãå¯èœãšãªãããã°ã®åå ã®ç¹å®ãšè§£æ¶ãã¹ã ãŒãºã«é²ããããŸãã
5. å®è·µçãªGoèšèªã®åŠç¿æ¹æ³
ããã°ã©ãã³ã°èšèªãåŠã¶ã«ã¯ãæžç±ããã¥ãŒããªã¢ã«ãèªãã ãã§ã¯ãªããç©æ¥µçã«å®è·µããããšãéèŠã§ããGoèšèªãäŸå€ã§ã¯ãããŸãããå ·äœçãªãããžã§ã¯ãã«åãçµãã ããé »ç¹ã«ã³ãŒãã£ã³ã°ãè¡ãããšã§çè«ã ãã§ãªãå®è·µçãªã¹ãã«ã身ã«ã€ããããšãã§ããŸãã
5.1 ã·ã³ãã«ãªãããžã§ã¯ããäœæãã
ãŸããã·ã³ãã«ãªãããžã§ã¯ããèªåã§äœæããããšããå§ããŠã¿ãŸããããäŸãã°ãHello, Worldãããå§ããŠãæ²ç€ºæ¿ã·ã¹ãã ãããã°ã®ãããªWebã¢ããªã±ãŒã·ã§ã³ãèªåã§äœæãããšè¯ãã§ããããå®éã«äœæããããšã§ãæ©èœã®è¿œå ãæ¹ä¿®ããšã©ãŒãã³ããªã³ã°çã«ééããããã解決ããããšã§Goèšèªãç解ãæ·±ããããšãã§ããŸãã
5.2 ãªãŒãã³ãœãŒã¹ãããžã§ã¯ãã«åå ãã
次ã«ãGoèšèªãæŽã«ç解ããŠããããã«ã¯ãªãŒãã³ãœãŒã¹ãããžã§ã¯ãã«åå ããã®ãéåžžã«æå¹ãªæ¹æ³ã§ããGitHubçã«å ¬éãããŠãããªãŒãã³ãœãŒã¹ãããžã§ã¯ãã«ã¯ãå€ãã®çµéšè±å¯ãªãšã³ãžãã¢ãå¯çš¿ããŠããã圌ãã®æžããã³ãŒããæèã®éçšãå£éèŠãããšãã§ããŸãããŸããèªåãçºèŠãããã°ãä¿®æ£ããããæ°æ©èœãææ¡ã»å®è£ ããããšã§å®éã®éçºçŸå Žã§ã®çµéšãç©ãããšãã§ããŸãã
5.3 é »ç¹ã«ã³ãŒãã£ã³ã°ãè¡ã
ãããŠäœããããé »ç¹ã«ã³ãŒãã£ã³ã°ãè¡ãããšãæãéèŠã§ããæ°ããæè¡ãåŠã¶äžã§äžçªå€§åãªã®ã¯ã䜿ãããªããããšããã®ããã«ã¯å®éã«æãåããããšãäžå¯æ¬ ã§ããæ¯æ¥å°ããã€ã§ãæ§ããªãã®ã§ã³ãŒããæžãç¿æ £ãã€ããŸããããGoèšèªã®åé¡ã解ããªã³ã©ã€ã³ã®ãã©ãããã©ãŒã çãå©çšãããšè¯ãã§ããããããã«ãããæ°ãã課é¡ãšåãåããªãããèªå·±ã®ã¹ãã«ãåŸã ã«ã§ã確å®ã«äŒžã°ããŠããããšãã§ããŸãã
6. Goèšèªã®åŠç¿ãæ·±ããããã®ãªãœãŒã¹
Goèšèªã®åŠç¿ãé²ããäžã§ãåŸãããç¥èãæ·±ããŠããããã«åœ¹ç«ã€ãªãœãŒã¹ã«ã€ããŠçŽ¹ä»ããŸããããããå©çšããããšã§ãæŠå¿µã®ç解ãæ·±ããããæ°ããªæè¡ãã¢ã€ãã¢ãåŸãããšãã§ããŸãã
6.1 ãªã³ã©ã€ã³ã³ãŒã¹ãšãã¥ãŒããªã¢ã«
ãªã³ã©ã€ã³ã³ãŒã¹ã¯ãç¬åŠè ãåŠã³ãé²ããäžã§éåžžã«æå¹ãªããŒã«ã§ããäŸãã°ãUdemyãCourseraãªã©ã®ãã©ãããã©ãŒã ã§ã¯ãGoèšèªã«ç¹åããã³ãŒã¹ãæäŸãããŠããŸãããã®äžã«ã¯ãåå¿è åãããäžçŽè åããŸã§ãæ§ã ãªã¬ãã«ã®åŠç¿è ã察象ãšããã³ãŒã¹ããããŸãã
ãŸãããã¥ãŒããªã¢ã«ããŸããå®éã«æãåãããªããåŠã¶ããã®ãšãŠãè¯ãããŒã«ã§ããå ¬åŒã®Goãã¥ãŒããªã¢ã«ã¯ãã¡ãããGo by ExampleãTour of Goãªã©ãå®è·µçãªãµã³ãã«ã³ãŒããçšããŠGoèšèªãåŠã¶ããšãã§ããŸãã
6.2 ããã°ãšæè¡æž
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