# \ucf54\ub4dc \ud3ec\ub9f7\ud130\ngo install golang.org\/x\/tools\/cmd\/goimports@latest\n\n# \ub9b0\ud130\ngo install github.com\/golangci\/golangci-lint\/cmd\/golangci-lint@latest<\/code><\/pre>\nGo\ub294 \ucf54\ub4dc \ud3ec\ub9f7\ud305 \uc2a4\ud0c0\uc77c\uc744 \uac15\uc81c\ud569\ub2c8\ub2e4. C\ucc98\ub7fc \uc2a4\ud0c0\uc77c \ub17c\uc7c1\uc774 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n
2\uc7a5. \uccab Go \ud504\ub85c\uadf8\ub7a8<\/h3>\nHello World<\/h4>\n
main.go<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n fmt.Println("Hello, World!")\n}<\/code><\/pre>\n\ube4c\ub4dc\uc640 \uc2e4\ud589<\/h4>\n# \ube4c\ub4dc (\ucef4\ud30c\uc77c + \ub9c1\ud06c \ud55c\ubc88\uc5d0)\ngo build\n\n# \uc2e4\ud589\n.\/hello\n\n# \ub610\ub294 \ube4c\ub4dc\ud558\uc9c0 \uc54a\uace0 \ubc14\ub85c \uc2e4\ud589\ngo run main.go<\/code><\/pre>\n2\ubd80: \uae30\ubcf8 \ubb38\ubc95<\/h2>\n3\uc7a5. \ubcc0\uc218\uc640 \ud0c0\uc785<\/h3>\n\n- \ubcc0\uc218 \uc120\uc5b8<\/li>\n<\/ul>\n
var x int = 10\nvar name string = "John"\nvar pi float64 = 3.14\n\n\/\/ \ub610\ub294 \ud0c0\uc785 \ucd94\ub860 \uc0ac\uc6a9\nvar x = 10 \/\/ int\ub85c \ucd94\ub860\nvar name = "John" \/\/ string\uc73c\ub85c \ucd94\ub860\nvar pi = 3.14 \/\/ float64\ub85c \ucd94\ub860<\/code><\/pre>\n\n- \uc804\uc5ed\ubcc0\uc218\uc640 \uc9c0\uc5ed\ubcc0\uc218<\/li>\n<\/ul>\n
\/\/ \uc804\uc5ed\ubcc0\uc218 (\ud328\ud0a4\uc9c0 \uc678\ubd80\uc5d0\uc11c\ub3c4 \uc811\uadfc\uac00\ub2a5)\nvar GlobalCounter int = 0\n\n\/\/ \uc804\uc5ed\ubcc0\uc218 (\ud328\ud0a4\uc9c0 \ub808\ubca8)\nvar globalName string = "Global"\n\n\/\/ \uc5ec\ub7ec \ubcc0\uc218 \ub3d9\uc2dc \uc120\uc5b8\nvar (\n MaxConnections int = 100\n DefaultTimeout int = 30\n ServerName string = "MyServer"\n)\n\nfunc main() {\n \/\/ \uc9c0\uc5ed\ubcc0\uc218 (\ud568\uc218 \ub0b4\ubd80)\n localVar := 10 \/\/ := \ub294 \ud568\uc218 \ub0b4\ubd80\uc5d0\uc11c\ub9cc \uc0ac\uc6a9 \uac00\ub2a5\n\n \/\/ \uc804\uc5ed\ubcc0\uc218\ub294 := \ub85c \uc120\uc5b8 \ubd88\uac00\n \/\/ GlobalCounter := 100 \/\/ \ucef4\ud30c\uc77c \uc5d0\ub7ec!\n\n GlobalCounter = 100 \/\/ OK: \uc804\uc5ed\ubcc0\uc218 \uac12 \ubcc0\uacbd\n}\n\n\/\/ \ub300\ubb38\uc790\ub85c \uc2dc\uc791\ud558\uba74 \ub2e4\ub978 \ud328\ud0a4\uc9c0\uc5d0\uc11c\ub3c4 \uc811\uadfc \uac00\ub2a5 (exported)\nvar ExportedVar int = 10 \/\/ public\uacfc \uc720\uc0ac\n\n\/\/ \uc18c\ubb38\uc790\ub85c \uc2dc\uc791\ud558\uba74 \uac19\uc740 \ud328\ud0a4\uc9c0 \ub0b4\uc5d0\uc11c\ub9cc \uc811\uadfc \uac00\ub2a5\nvar privateVar int = 10 \/\/ private\uacfc \uc720\uc0ac<\/code><\/pre>\n\n- \uae30\ubcf8 \ud0c0\uc785 \ube44\uad50<\/li>\n<\/ul>\n
\n\n\n| C \ud0c0\uc785<\/th>\n | Go \ud0c0\uc785<\/th>\n | \uc124\uba85<\/th>\n<\/tr>\n<\/thead>\n |
\n\n| char<\/td>\n | byte (\ub610\ub294 uint8)<\/td>\n | 8\ube44\ud2b8 \ubd80\ud638 \uc5c6\ub294 \uc815\uc218<\/td>\n<\/tr>\n |
\n| int<\/td>\n | int<\/td>\n | \ud50c\ub7ab\ud3fc \uc758\uc874\uc801 (32 \ub610\ub294 64\ube44\ud2b8)<\/td>\n<\/tr>\n |
\n| long<\/td>\n | int64<\/td>\n | 64\ube44\ud2b8 \uc815\uc218<\/td>\n<\/tr>\n |
\n| float<\/td>\n | float32<\/td>\n | 32\ube44\ud2b8 \ubd80\ub3d9\uc18c\uc218\uc810<\/td>\n<\/tr>\n |
\n| double<\/td>\n | float64<\/td>\n | 64\ube44\ud2b8 \ubd80\ub3d9\uc18c\uc218\uc810<\/td>\n<\/tr>\n |
\n| char*<\/td>\n | string<\/td>\n | \ubd88\ubcc0 \ubb38\uc790\uc5f4 (\uc911\uc694!)<\/td>\n<\/tr>\n |
\n| –<\/td>\n | rune<\/td>\n | UTF-8 \ubb38\uc790 (int32\uc758 \ubcc4\uce6d)<\/td>\n<\/tr>\n |
\n| –<\/td>\n | bool<\/td>\n | true\/false<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n- \ud0c0\uc785 \ucd94\ub860\uacfc := \uc5f0\uc0b0\uc790<\/li>\n<\/ul>\n
\/\/ \uc804\ud1b5\uc801\uc778 \ubc29\uc2dd\nvar x int = 10\nvar name string = "John"\n\n\/\/ \ud0c0\uc785 \ucd94\ub860\nvar x = 10\nvar name = "John"\n\n\/\/ \uc9e7\uc740 \uc120\uc5b8 (\ud568\uc218 \ub0b4\ubd80\uc5d0\uc11c\ub9cc \uc0ac\uc6a9 \uac00\ub2a5, \uc0c8\ub85c\uc6b4 \ubcc0\uc218\ub97c \uc120\uc5b8\ud560 \ub54c\ub9cc)\nx := 10\nname := "John"\npi := 3.14<\/code><\/pre>\n\n- \ud3ec\uc778\ud130: C\uc640\uc758 \uc720\uc0ac\uc810\uacfc \ucc28\uc774\uc810<\/li>\n<\/ul>\n
\/\/ \uc720\uc0ac\uc810\nx := 10\np := &x\n*p = 20 \/\/ x\uac00 20\uc73c\ub85c \ubcc0\uacbd\ub428\n\n\/\/ \ucc28\uc774\uc810\narr := [5]int{1, 2, 3, 4, 5}\np := &arr[0]\n\/\/ p++ \/\/ \ucef4\ud30c\uc77c \uc5d0\ub7ec!\n\/\/ p += 2 \/\/ \ucef4\ud30c\uc77c \uc5d0\ub7ec!\n\n\/\/ NULL \ub300\uc2e0 nil\nvar p *int = nil<\/code><\/pre>\ntype Person struct {\n Name string\n Age int\n}\np := &Person{}\np.Age = 30 \/\/ \uc790\ub3d9\uc73c\ub85c \uc5ed\ucc38\uc870\ub428 (*p).Age\uc640 \uac19\uc74c<\/code><\/pre>\np := new(int) \/\/ *int \ud0c0\uc785, 0\uc73c\ub85c \ucd08\uae30\ud654\ub428\n*p = 10\n\/\/ \uc790\ub3d9\uc73c\ub85c \uba54\ubaa8\ub9ac \ud574\uc81c<\/code><\/pre>\n\n- \ud0c0\uc785 \ubcc0\ud658<\/li>\n<\/ul>\n
var x int = 10\nvar y float64 = float64(x) \/\/ \uba85\uc2dc\uc801 \ubcc0\ud658 \ud544\uc694<\/code><\/pre>\n4\uc7a5. \ud568\uc218<\/h3>\n\n- \ud568\uc218 \uc120\uc5b8\uacfc \ud638\ucd9c<\/li>\n<\/ul>\n
func add(a int, b int) int {\n return a + b\n}\n\n\/\/ \uac19\uc740 \ud0c0\uc785 \ud30c\ub77c\ubbf8\ud130\ub294 \ud55c \ubc88\ub9cc \uba85\uc2dc \uac00\ub2a5\nfunc add(a, b int) int {\n return a + b\n}\n\nfunc printHello() {\n fmt.Println("Hello")\n}\n\nfunc main() {\n result := add(3, 5)\n printHello()\n \/\/ return \ubb38 \ubd88\ud544\uc694 (main\uc5d0\uc11c)\n}<\/code><\/pre>\n\n- \ub2e4\uc911 \ubc18\ud658\uac12 (C\uc5d0\ub294 \uc5c6\ub294 \uae30\ub2a5)<\/li>\n<\/ul>\n
func divide(a, b int) (int, int) {\n quotient := a \/ b\n remainder := a % b\n return quotient, remainder\n}\n\nfunc main() {\n q, r := divide(10, 3)\n fmt.Printf("Quotient: %d, Remainder: %d\\n", q, r)\n \/\/ \ucd9c\ub825: Quotient: 3, Remainder: 1\n}<\/code><\/pre>\n\n- Named return values<\/li>\n<\/ul>\n
\/\/ \uba85\uba85\ub41c \ubc18\ud658\uac12 \uc0ac\uc6a9\nfunc divide(a, b int) (quotient, remainder int) {\n quotient = a \/ b\n remainder = a % b\n return \/\/ naked return (\uac12 \uba85\uc2dc \ubd88\ud544\uc694)\n}<\/code><\/pre>\n\n- \uac00\ubcc0 \uc778\uc790 \ud568\uc218<\/li>\n<\/ul>\n
func sum(numbers ...int) int {\n total := 0\n for _, num := range numbers {\n total += num\n }\n return total\n}\n\n\/\/ \uc0ac\uc6a9\nresult := sum(10, 20, 30)\nresult2 := sum(1, 2, 3, 4, 5)\nresult3 := sum() \/\/ \uc778\uc790 \uc5c6\uc774\ub3c4 \ud638\ucd9c \uac00\ub2a5<\/code><\/pre>\n\n- \ud568\uc218\ub97c \uac12\uc73c\ub85c \ub2e4\ub8e8\uae30<\/li>\n<\/ul>\n
Go\uc5d0\uc11c \ud568\uc218\ub294 \uc77c\uae09 \uac1d\uccb4(first-class citizen)<\/strong>\uc785\ub2c8\ub2e4.<\/p>\n\/\/ \ud568\uc218 \ud0c0\uc785 \uc815\uc758\ntype operation func(int, int) int\n\nfunc add(a, b int) int { return a + b }\nfunc subtract(a, b int) int { return a - b }\n\nfunc calculate(a, b int, op operation) int {\n return op(a, b)\n}\n\nfunc main() {\n result := calculate(10, 5, add)\n result = calculate(10, 5, subtract)\n}<\/code><\/pre>\n5\uc7a5. \uc81c\uc5b4 \uad6c\uc870<\/h3>\n\n- if\ubb38 (\uc120\uc5b8\ubb38 \ud3ec\ud568 \uac00\ub2a5)<\/li>\n<\/ul>\n
Go\uc758 if\ubb38\uc740 C\uc640 \ube44\uc2b7\ud558\uc9c0\ub9cc \uc870\uac74\uc2dd\uc744 \uad04\ud638\ub85c \uac10\uc2f8\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub300\uc2e0 \uc911\uad04\ud638\ub294 \ud544\uc218\uc785\ub2c8\ub2e4.<\/p>\n if x > 10 {\n fmt.Println("\ud06c\ub2e4")\n}<\/code><\/pre>\n\uc870\uac74\uc2dd \uc548\uc5d0\uc11c \ubcc0\uc218 \uc0dd\uc131\uc774 \uac00\ub2a5\ud569\ub2c8\ub2e4.<\/p>\n package main\n\nimport (\n "fmt"\n)\n\nfunc getValue() int {\n return 0\n}\n\nfunc main() {\n if val := getValue(); val > 0 {\n fmt.Println("\uc591\uc218:", val)\n } else {\n fmt.Println("\uc74c\uc218 \ub610\ub294 0:", val) \/\/ val\uc740 \uc5ec\uc804\ud788 \uc720\ud6a8\n }\n}<\/code><\/pre>\n\n- for\ubb38 (Go\uc758 \uc720\uc77c\ud55c \ubc18\ubcf5\ubb38)<\/li>\n<\/ul>\n
Go\uc5d0\ub294 for\ubb38\ub9cc \uc874\uc7ac\ud569\ub2c8\ub2e4. while\uc774\ub098 do-while\uc740 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n \/\/ C\uc640 \uac70\uc758 \ub3d9\uc77c\ud558\uc9c0\ub9cc \uad04\ud638\uac00 \uc5c6\uc74c\nfor i := 0; i < 10; i++ {\n fmt.Println(i)\n}\n\nfor {\n \/\/ \ubb34\ud55c \ubc18\ubcf5\n if shouldStop {\n break\n }\n}<\/code><\/pre>\nrange \ud0a4\uc6cc\ub4dc<\/p>\n \/\/ \ubc30\uc5f4\/\uc2ac\ub77c\uc774\uc2a4 \uc21c\ud68c\nnumbers := []int{10, 20, 30, 40, 50}\nfor index, value := range numbers {\n fmt.Printf("numbers[%d] = %d\\n", index, value)\n}\n\n\/\/ \uc778\ub371\uc2a4\ub9cc \ud544\uc694\ud55c \uacbd\uc6b0\nfor i := range numbers {\n fmt.Println(i)\n}\n\n\/\/ \uac12\ub9cc \ud544\uc694\ud55c \uacbd\uc6b0 (\uc778\ub371\uc2a4 \ubb34\uc2dc)\nfor _, value := range numbers {\n fmt.Println(value)\n}<\/code><\/pre>\n\n- switch\ubb38 (break \ubd88\ud544\uc694, fallthrough)<\/li>\n
- defer \ubb38 (C\uc5d0\ub294 \uc5c6\ub294 \uae30\ub2a5)<\/li>\n<\/ul>\n
\ud568\uc218\uac00 \uc885\ub8cc\ub418\uae30 \uc9c1\uc804\uc5d0 \ud2b9\uc815 \ucf54\ub4dc\ub97c \uc2e4\ud589\ud558\ub3c4\ub85d \uc608\uc57d\ud558\ub294 \uae30\ub2a5.
\n\uc5ec\ub7ec \uac1c\uc758 defer \ubb38\uc774 \uc788\uc73c\uba74 LIFO(Last In First Out) \uc21c\uc11c\ub85c \uc2e4\ud589.<\/p>\n func example() {\n defer fmt.Println("\ub9c8\uc9c0\ub9c9")\n defer fmt.Println("\ub450 \ubc88\uc9f8")\n fmt.Println("\uccab \ubc88\uc9f8")\n}\n\/\/ \ucd9c\ub825:\n\/\/ \uccab \ubc88\uc9f8\n\/\/ \ub450 \ubc88\uc9f8\n\/\/ \ub9c8\uc9c0\ub9c9<\/code><\/pre>\n3\ubd80: \uba54\ubaa8\ub9ac\uc640 \ub370\uc774\ud130 \uad6c\uc870<\/h2>\n6\uc7a5. \ud3ec\uc778\ud130 \uc2ec\ud654<\/h3>\n\n- C \ud3ec\uc778\ud130\uc640 Go \ud3ec\uc778\ud130\uc758 \ucc28\uc774<\/li>\n
- \ud3ec\uc778\ud130 \uc0b0\uc220 \uc5f0\uc0b0\uc774 \uc5c6\ub294 \uc774\uc720<\/li>\n
- nil\uacfc NULL<\/li>\n
- \ud3ec\uc778\ud130\ub97c \uc0ac\uc6a9\ud558\ub294 \uc2dc\uae30<\/li>\n<\/ul>\n
7\uc7a5. \ubc30\uc5f4\uacfc \uc2ac\ub77c\uc774\uc2a4<\/h3>\n\n- \n
\ubc30\uc5f4\uacfc \uc2ac\ub77c\uc774\uc2a4<\/p>\n \ubc30\uc5f4\uc740 \ud06c\uae30\uac00 \uace0\uc815\uc774\ub2e4. \uc18d\ub3c4\uac00 \ube60\ub974\ub2e4. \ud568\uc218 \uc804\ub2ec\uc2dc \ud3ec\uc778\ud130\ub97c \uc804\ub2ec\ud574\uc57c \ud55c\ub2e4.<\/p>\n \uc2ac\ub77c\uc774\uc2a4\ub294 \ud06c\uae30\ub97c \ubcc0\uacbd\ud560 \uc218 \uc788\ub2e4. \ucc38\uc870 \ud0c0\uc785\uc774\uae30\uc5d0 \ud568\uc218\uc5d0 \uadf8\ub300\ub85c \uc804\ub2ec \uac00\ub2a5\ud558\ub2e4.<\/p>\n<\/li>\n<\/ul>\n \/\/ \ubc30\uc5f4 - \uac70\uc758 \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uc74c\nvar arr [5]int = [5]int{1, 2, 3, 4, 5}\n\n\/\/ \uc2ac\ub77c\uc774\uc2a4 - \uc77c\ubc18\uc801\uc73c\ub85c \uc0ac\uc6a9\nslice := []int{1, 2, 3, 4, 5}\nslice = append(slice, 6) \/\/ \ub3d9\uc801\uc73c\ub85c \ud655\uc7a5 \uac00\ub2a5\n\n\/\/ \uc2ac\ub77c\uc774\uc2a4 \uc0dd\uc131 \ubc29\ubc95\ub4e4\ns1 := make([]int, 5) \/\/ \uae38\uc774 5\ns2 := make([]int, 0, 10) \/\/ \uae38\uc774 0, \uc6a9\ub7c9 10\ns3 := []string{"a", "b", "c"}<\/code><\/pre>\n\n- \uc2ac\ub77c\uc774\uc2a4 \ub0b4\ubd80 \uad6c\uc870 \uc774\ud574<\/li>\n<\/ul>\n
s1 := make([]int, 5) \/\/ \uae38\uc774 5\ns2 := make([]int, 0, 10) \/\/ \uae38\uc774 0, \uc6a9\ub7c9 10<\/code><\/pre>\n\uc6a9\ub7c9\uc744 \uc9c0\uc815\ud558\uc9c0 \uc54a\ub294 \uacbd\uc6b0, \uc6a9\ub7c9\uc774 \ubd80\uc871\ud558\uba74 2\ubc30 \ud06c\uae30\uc758 \uc2ac\ub77c\uc774\uc2a4\ub97c \uc0c8\ub85c\uc0dd\uc131\ud558\uace0 \uac12\uc744 \ubcf5\uc0ac\ud55c\ub2e4.<\/p>\n \n- make\uc640 new\uc758 \ucc28\uc774<\/li>\n<\/ul>\n
\n\n\n| \uad6c\ubd84<\/th>\n | new<\/th>\n | make<\/th>\n<\/tr>\n<\/thead>\n | \n\n| \uc801\uc6a9 \ub300\uc0c1<\/td>\n | \ubaa8\ub4e0 \ud0c0\uc785<\/td>\n | slice, map, channel\ub9cc<\/td>\n<\/tr>\n | \n| \ubc18\ud658 \ud0c0\uc785<\/td>\n | \ud3ec\uc778\ud130 (*T<\/code>)<\/td>\n\ucc38\uc870 \ud0c0\uc785 (T<\/code>)<\/td>\n<\/tr>\n\n| \ucd08\uae30\ud654<\/td>\n | \uc81c\ub85c\uac12\uc73c\ub85c \ucd08\uae30\ud654<\/td>\n | \uc0ac\uc6a9 \uac00\ub2a5\ud55c \uc0c1\ud0dc\ub85c \ucd08\uae30\ud654<\/td>\n<\/tr>\n | \n| \uba54\ubaa8\ub9ac \ud560\ub2f9<\/td>\n | \uba54\ubaa8\ub9ac\ub9cc \ud560\ub2f9<\/td>\n | \ub0b4\ubd80 \uad6c\uc870\uae4c\uc9c0 \ucd08\uae30\ud654<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\np := new(Person) \/\/ &Person{} \uc640 \ub3d9\uc77c<\/code><\/pre>\n\ucc38\uc870\ud0c0\uc785\uc744 \ubc18\ud658\ud558\uba70, \ud568\uc218 \ud30c\ub77c\ubbf8\ud130\ub85c \uc804\ub2ec\ub420 \ub54c\uc5d0\ub3c4 \ubcf5\uc0ac\uac00 \uc544\ub2cc \ucc38\uc870\uac00 \uc804\ub2ec\ub41c\ub2e4.<\/p>\n s := make([]int, 0, 10)\nm := make(map[string]int)\nch := make(chan int)<\/code><\/pre>\n\n- append\uc640 copy<\/li>\n<\/ul>\n
8\uc7a5. \ub9f5\uacfc \uad6c\uc870\uccb4<\/h3>\n\n- \uad6c\uc870\uccb4<\/li>\n<\/ul>\n
type Person struct {\n Name string\n Age int\n Height float64\n}\n\n\/\/ \ub9ac\ud130\ub7f4\ub85c \ucd08\uae30\ud654\np := Person{\n Name: "Alice",\n Age: 30,\n Height: 165.5,\n}\n\n\/\/ \ud544\ub4dc\ub9cc \uc9c0\uc815 (\uc21c\uc11c \ubb34\uad00)\np2 := Person{Age: 25, Name: "Bob"}\n\n\/\/ \ud3ec\uc778\ud130\ub85c \uc811\uadfc (-> \uc5f0\uc0b0\uc790 \ubd88\ud544\uc694!)\nptr := &p\nptr.Age = 31 \/\/ Go\ub294 \uc790\ub3d9\uc73c\ub85c \uc5ed\ucc38\uc870<\/code><\/pre>\n\/\/ \ud0c0\uc785 \uc774\ub984 \uc5c6\uc774 \ubc14\ub85c \uc0ac\uc6a9\nconfig := struct {\n Host string\n Port int\n}{\n Host: "localhost",\n Port: 8080,\n}\n\nfmt.Println(config.Host) \/\/ localhost<\/code><\/pre>\n\n- \uba54\uc11c\ub4dc \ucd94\uac00\ud558\uae30<\/li>\n<\/ul>\n
type Rectangle struct {\n Width int\n Height int\n}\n\n\/\/ \uac12 \ub9ac\uc2dc\ubc84 (\ubcf5\uc0ac\ubcf5\uc744 \uc2e4\ud589)\nfunc (r Rectangle) Area() int {\n return r.Width * r.Height\n}\n\n\/\/ \ud3ec\uc778\ud130 \ub9ac\uc2dc\ubc84 (\uc2e4\uc81c \uac12\uc744 \ubcc0\uacbd)\nfunc (r *Rectangle) Scale(factor int) {\n r.Width *= factor\n r.Height *= factor\n}\n\n\/\/ \uc0ac\uc6a9\nrect := Rectangle{Width: 10, Height: 5}\nfmt.Println(rect.Area()) \/\/ 50\n\nrect.Scale(2)\nfmt.Println(rect.Area()) \/\/ 200<\/code><\/pre>\n\n- \ub9f5(Map): \ub0b4\uc7a5 \ud574\uc2dc\ud14c\uc774\ube14<\/li>\n<\/ul>\n
\/\/ \uc120\uc5b8\uacfc \ucd08\uae30\ud654\nages := map[string]int{\n "Alice": 30,\n "Bob": 25,\n "Carol": 35,\n}\n\n\/\/ \ucd94\uac00\/\uc218\uc815\nages["Dave"] = 40\n\n\/\/ \uc870\ud68c\nage := ages["Alice"]\nfmt.Println(age) \/\/ 30\n\n\/\/ \uc0ad\uc81c\ndelete(ages, "Bob")\n\n\/\/ \uc874\uc7ac \ud655\uc778\nage, exists := ages["Eve"]\nif exists {\n fmt.Println("Eve's age:", age)\n} else {\n fmt.Println("Eve not found")\n}<\/code><\/pre>\n4\ubd80: \uba54\ubaa8\ub9ac \uad00\ub9ac<\/h2>\n9\uc7a5. \uac00\ube44\uc9c0 \uceec\ub809\uc158<\/h3>\n\n- malloc\/free\uc5d0\uc11c GC\ub85c<\/li>\n<\/ul>\n
type Person struct {\n Name string\n Age int\n}\n\nfunc createPerson(name string, age int) *Person {\n p := &Person{\n Name: name,\n Age: age,\n }\n return p\n \/\/ free() \ud638\ucd9c \ubd88\ud544\uc694! GC\uac00 \uc790\ub3d9\uc73c\ub85c \ucc98\ub9ac\n}\n\nfunc main() {\n p := createPerson("Alice", 30)\n \/\/ p\ub97c \uc0ac\uc6a9\n \/\/ \ub354 \uc774\uc0c1 \ucc38\uc870\ub418\uc9c0 \uc54a\uc73c\uba74 GC\uac00 \uc790\ub3d9\uc73c\ub85c \uba54\ubaa8\ub9ac \ud68c\uc218\n}<\/code><\/pre>\n\n- \uc2a4\ud0dd vs \ud799 \ud560\ub2f9<\/li>\n<\/ul>\n
go \ucef4\ud30c\uc77c\ub7ec\uac00 \uc2a4\ud0dd(\uc784\uc2dc\uba54\ubaa8\ub9ac) \uc5d0 \uc800\uc7a5\ud560\uc9c0 \ud799\uc5d0 \uc800\uc7a5\ud560\uc9c0\ub97c \uc790\ub3d9\uc73c\ub85c \uc120\ud0dd\ud569\ub2c8\ub2e4.<\/p>\n func stackAllocation() *int {\n x := 42\n return &x \/\/ C\uc5d0\uc11c\ub294 \uc704\ud5d8! Go\uc5d0\uc11c\ub294 \uc548\uc804\n}\n\nfunc heapAllocation() *int {\n x := 42\n return &x \/\/ \ucef4\ud30c\uc77c\ub7ec\uac00 x\ub97c \ud799\uc5d0 \ud560\ub2f9\n}\n\nfunc localOnly() {\n x := 42\n println(x) \/\/ x\ub294 \uc2a4\ud0dd\uc5d0 \ud560\ub2f9 (\ud568\uc218 \ubc16\uc73c\ub85c \ub098\uac00\uc9c0 \uc54a\uc74c)\n}<\/code><\/pre>\n10\uc7a5. \uba54\ubaa8\ub9ac \uc548\uc804\uc131<\/h3>\n\n- \n
\ubc84\ud37c \uc624\ubc84\ud50c\ub85c\uc6b0 \ubc29\uc9c0<\/p>\n \uc5b8\uc5b4\ub808\ubca8\uc5d0\uc11c \uc624\ubc84\ud50c\ub85c\uc6b0\ub97c \ucc28\ub2e8\ud569\ub2c8\ub2e4.<\/p>\n<\/li>\n<\/ul>\n arr := [5]int{1, 2, 3, 4, 5}\nfmt.Println(arr[4]) \/\/ OK\n\/\/ fmt.Println(arr[5]) \/\/ panic: runtime error: index out of range [5] with length 5\n\n\/\/ \uc2ac\ub77c\uc774\uc2a4\ub3c4 \ub9c8\ucc2c\uac00\uc9c0\nslice := []int{1, 2, 3}\n\/\/ value := slice[10] \/\/ panic: runtime error: index out of range [10] with length 3<\/code><\/pre>\n\n- \ub315\uae00\ub9c1 \ud3ec\uc778\ud130 \ubb38\uc81c \ud574\uacb0<\/li>\n<\/ul>\n
func noMoreDangling() *int {\n local := 42\n return &local \/\/ Go \ucef4\ud30c\uc77c\ub7ec\uac00 \uc790\ub3d9\uc73c\ub85c \ud799\uc5d0 \ud560\ub2f9\n}\n\nfunc main() {\n ptr := noMoreDangling()\n fmt.Println(*ptr) \/\/ 42 - \uc644\uc804\ud788 \uc548\uc804\ud568!\n}<\/code><\/pre>\n\n- \uba54\ubaa8\ub9ac \ub204\uc218 \ubc29\uc9c0<\/li>\n<\/ul>\n
\/\/ \ubb38\uc81c\uac00 \uc788\ub294 \ucf54\ub4dc\nfunc processData(data []byte) []byte {\n \/\/ \ud070 \uc2ac\ub77c\uc774\uc2a4\uc5d0\uc11c \uc791\uc740 \ubd80\ubd84\ub9cc \ud544\uc694\ud55c \uacbd\uc6b0\n result := data[0:10] \/\/ \uc804\uccb4 \ubc30\uc5f4\uc744 \ucc38\uc870\ud558\uace0 \uc788\uc74c!\n return result\n}\n\n\/\/ \uc62c\ubc14\ub978 \ubc29\ubc95\nfunc processDataCorrectly(data []byte) []byte {\n result := make([]byte, 10)\n copy(result, data[0:10]) \/\/ \ud544\uc694\ud55c \ubd80\ubd84\ub9cc \ubcf5\uc0ac\n return result\n}<\/code><\/pre>\n\n- \n
unsafe \ud328\ud0a4\uc9c0 (\uc8fc\uc758\ud574\uc11c \uc0ac\uc6a9\ud558\uae30)<\/p>\n \uc704\uc640 \uac19\uc740 \uc5b8\uc5b4\ub808\ubca8 \uccb4\ud06c\ub97c \ubc30\uc81c\ud558\uae30 \uc704\ud574 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.
\n\uc131\ub2a5\uc774 \uadf9\ub3c4\ub85c \uc911\uc694\ud55c \ubd80\ubd84\uc5d0 \uc81c\ud55c\uc801\uc73c\ub85c \uc0ac\uc6a9\ub418\uc5b4\uc57c \ud569\ub2c8\ub2e4.<\/p>\n<\/li>\n<\/ul>\n 5\ubd80: \ub3d9\uc2dc\uc131<\/h2>\n11\uc7a5. \uace0\ub8e8\ud2f4<\/h3>\n\uc5b8\uc5b4\ub808\ubca8\uc5d0\uc11c \uc2a4\ub808\ub4dc\ub97c \uc9c0\uc6d0\ud569\ub2c8\ub2e4.
\ngo<\/code> \ud0a4\uc6cc\ub4dc\ub97c \uc0ac\uc6a9\ud558\ub294 \uac83\uc73c\ub85c \uc2a4\ub808\ub4dc\uac00 \uc0dd\uc131\ub429\ub2c8\ub2e4.
\n\uba54\uc778 \ud568\uc218\uac00 \uc885\ub8cc\ub428\uacfc \ub3d9\uc2dc\uc5d0 \uc2a4\ub808\ub4dc\ub3c4 \uc885\ub8cc\ub418\ubbc0\ub85c \uc801\uc808\ud55c \ub3d9\uae30\ud654\ub97c \ud574\uc8fc\uc5b4\uc57c \ud569\ub2c8\ub2e4.
\n(\ucc44\ub110 \ucc55\ud130 \ucc38\uc870)<\/p>\npackage main\n\nimport (\n "fmt"\n "time"\n)\n\nfunc worker(id int) {\n fmt.Printf("Worker %d\\n", id)\n}\n\nfunc main() {\n for i := 0; i < 10; i++ {\n go worker(i) \/\/ \uace0\ub8e8\ud2f4 \uc0dd\uc131\uc740 \ub2e8 \ud55c \uc904!\n }\n\n time.Sleep(3 * time.Second) \/\/ \uace0\ub8e8\ud2f4\uc774 \ub05d\ub098\uae38 \uae30\ub2e4\ub9bc (\uc784\uc2dc \ubc29\ud3b8)\n}<\/code><\/pre>\n12\uc7a5. \ucc44\ub110<\/h3>\n\n"\uba54\ubaa8\ub9ac\ub97c \uacf5\uc720\ud574\uc11c \ud1b5\uc2e0\ud558\uc9c0 \ub9d0\uace0, \ud1b5\uc2e0\ud574\uc11c \uba54\ubaa8\ub9ac\ub97c \uacf5\uc720\ud558\ub77c"
\n(Don’t communicate by sharing memory; share memory by communicating)<\/p>\n<\/blockquote>\n \n- \ucc44\ub110\uc758 \uac1c\ub150\uacfc \uc0ac\uc6a9\ubc95<\/li>\n<\/ul>\n
\ucc44\ub110\uc744 \uc774\uc694\ud574 \uac12\uc744 \uc804\ub2ec\ud558\uace0 \uc218\uc2e0\ud569\ub2c8\ub2e4.<\/p>\n package main\n\nimport "fmt"\n\nfunc main() {\n \/\/ \ucc44\ub110 \uc0dd\uc131\n ch := make(chan int)\n\n \/\/ \uace0\ub8e8\ud2f4\uc5d0\uc11c \ucc44\ub110\ub85c \ub370\uc774\ud130 \uc804\uc1a1\n go func() {\n ch <- 42 \/\/ \ucc44\ub110\uc5d0 \uac12 \ubcf4\ub0b4\uae30\n }()\n\n \/\/ \uba54\uc778 \uace0\ub8e8\ud2f4\uc5d0\uc11c \ub370\uc774\ud130 \uc218\uc2e0\n value := <-ch \/\/ \ucc44\ub110\uc5d0\uc11c \uac12 \ubc1b\uae30\n fmt.Println(value)\n}<\/code><\/pre>\n\n- \ubc84\ud37c\ub4dc \ucc44\ub110 vs \uc5b8\ubc84\ud37c\ub4dc \ucc44\ub110<\/li>\n<\/ul>\n
\uc5b8\ubc84\ud37c\ub4dc \ucc44\ub110<\/strong> – \ub3d9\uae30 \ubc29\uc2dd<\/p>\npackage main\n\nimport "fmt"\n\nfunc main() {\n ch := make(chan int) \/\/ \ubc84\ud37c \uc5c6\uc74c\n\n go func() {\n fmt.Println("\uace0\ub8e8\ud2f4: \ub370\uc774\ud130 \uc804\uc1a1 \uc2dc\uc791")\n ch <- 42 \/\/ \ub204\uad70\uac00 \ubc1b\uc744 \ub54c\uae4c\uc9c0 \ube14\ub85d\ub428\n fmt.Println("\uace0\ub8e8\ud2f4: \ub370\uc774\ud130 \uc804\uc1a1 \uc644\ub8cc")\n }()\n\n fmt.Println("\uba54\uc778: \ub370\uc774\ud130 \uc218\uc2e0 \ub300\uae30")\n value := <-ch \/\/ \ub204\uad70\uac00 \ubcf4\ub0bc \ub54c\uae4c\uc9c0 \ube14\ub85d\ub428\n fmt.Printf("\uba54\uc778: \uc218\uc2e0\ud55c \uac12 = %d\\n", value)\n}<\/code><\/pre>\n\ubc84\ud37c\ub4dc \ucc44\ub110<\/strong> – \ube44\ub3d9\uae30 \ubc29\uc2dd<\/p>\npackage main\n\nimport (\n "fmt"\n "time"\n)\n\nfunc main() {\n ch := make(chan int, 3) \/\/ \ubc84\ud37c \ud06c\uae30 3\n\n \/\/ \ubc84\ud37c\uac00 \uac00\ub4dd \ucc30 \ub54c\uae4c\uc9c0 \ube14\ub85d\ub418\uc9c0 \uc54a\uc74c\n ch <- 1\n ch <- 2\n ch <- 3\n fmt.Println("3\uac1c\uc758 \uac12\uc744 \uc804\uc1a1\ud568")\n\n \/\/ \uc774 \uc2dc\uc810\uc5d0\uc11c ch <- 4\ub97c \ud558\uba74 \ube14\ub85d\ub428\n\n go func() {\n time.Sleep(time.Second)\n fmt.Println(<-ch) \/\/ 1\n fmt.Println(<-ch) \/\/ 2\n fmt.Println(<-ch) \/\/ 3\n }()\n\n time.Sleep(2 * time.Second)\n}<\/code><\/pre>\n\n- select \ubb38<\/li>\n<\/ul>\n
select<\/code>\ub294 \uc5ec\ub7ec \ucc44\ub110 \uc791\uc5c5\uc744 \ub3d9\uc2dc\uc5d0 \ub300\uae30\ud560 \uc218 \uc788\uac8c \ud574\uc90d\ub2c8\ub2e4.<\/p>\npackage main\n\nimport (\n "fmt"\n "time"\n)\n\nfunc main() {\n ch1 := make(chan string)\n ch2 := make(chan string)\n\n go func() {\n time.Sleep(1 * time.Second)\n ch1 <- "one"\n }()\n\n go func() {\n time.Sleep(2 * time.Second)\n ch2 <- "two"\n }()\n\n \/\/ \ub450 \ucc44\ub110 \uc911 \uba3c\uc800 \uc900\ube44\ub41c \uac83\uc744 \ucc98\ub9ac\n for i := 0; i < 2; i++ {\n select {\n case msg1 := <-ch1:\n fmt.Println("received", msg1)\n case msg2 := <-ch2:\n fmt.Println("received", msg2)\n }\n }\n}<\/code><\/pre>\n13\uc7a5. \ub3d9\uc2dc\uc131 \ud328\ud134<\/h3>\n\n- Worker Pool \ud328\ud134<\/li>\n
- Pipeline \ud328\ud134<\/li>\n
- Fan-out, Fan-in<\/li>\n
- Context\ub97c \uc774\uc6a9\ud55c \ucde8\uc18c \ucc98\ub9ac<\/li>\n
- sync \ud328\ud0a4\uc9c0 (Mutex, WaitGroup \ub4f1)<\/li>\n<\/ul>\n
6\ubd80: \uc2e4\uc804 Go<\/h2>\n14\uc7a5. \uc5d0\ub7ec \ucc98\ub9ac<\/h3>\n
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