The rule is that public functions, types, etc., should be upper case.
Variable
package main
import "fmt"
func main(){
var msg string
msg = "hello world"
fmt.Println(msg)
msg := "hello world"
fmt.Println(msg)
a, b:= 10, 15
}
基本データ型
package main
import "fmt"
func main(){
a := 10
b := 12.3
c := "hoge"
var d bool
fmt.Printf("a: %d, b:%f, c:%s, d:%t\n", a, b, c, d)
}
const, iota: https://github.com/golang/go/wiki/Iota
package main
import "fmt"
func main(){
// const name = "yoshida"
// name = "tanaka"
const (
sun = iota
mon
tue
)
fmt.Println(sun, mon, tue)
}
pointer
package main
import "fmt"
func main(){
a := 5
var pa *int
pa = &a // a address
fmt.Println(pa)
fmt.Println(*pa)
}
function
package main
import "fmt"
func hi(name string) string{
msg := "hi!" + name
return msg
}
func main(){
fmt.Println(hi("tanaka"))
}
swap
package main
import "fmt"
func swap(a, b int)(int, int){
return b, a
}
func main(){
fmt.Println(swap(5, 2))
}
array
a := [...]int{1, 3, 5}
a := [5]int{1, 3, 5, 8, 9}
s := a[2:4]
fmt.Println(s)
fmt.Println(len(s))
fmt.Println(cap(s))
s := []int{1, 3, 5}
s = append(s, 8, 2, 10)
t := make([]int, len(s))
n := copy(t, s)
map
m := make(map[string]int) m["tanaka"] = 200 m["sato"] = 300 fmt.Println(m)
if
score := 83
if score > 80 {
fmt.Println("great")
} else {
fmt.Println("soso")
}
range
s := []int{2, 3, 8}
for i, v := range s{
fmt.Println(i, v)
構造体
type user struct {
name string
score int
}
func main(){
u := new(user)
u.name = "tanaka"
fmt.Println(u)
}
go routine
package main
import (
"fmt"
"time"
)
func task1(){
time.Sleep(time.Second * 2)
fmt.Println("task1 finished!")
}
func task2(){
fmt.Println("task2 finished!")
}
func main(){
go task1()
go task2()
time.Sleep(time.Second * 3)
}
