Go Example--range

package main
import "fmt"
func main()  {
	nums := []int{2,3,4}
	sum :=0
	//rang 遍历切片
	for _,num := range nums {
		sum += num
	}
	fmt.Println("sum:",sum)
	for i,num := range nums {
		if num == 3 {
			fmt.Println("index:",i)
		}
	}
	kvs := map[string]string{"a":"apple","b":"banana"}
	//range遍历map
	for k,v := range kvs{
		fmt.Printf("%s-> %s\n",k,v)
	}
	//range遍历字符串
	for i,c := range "go" {
		fmt.Println(i,c)
	}
	//range还可以遍历channel
}