range

// range 如何遍历slice，遍历map映射一样

import "fmt"

func main() {

    // range遍历求和

    nums := []int{2, 3, 4}

    sum := 0

    for _, num := range nums {

        sum += num

    }

    fmt.Println("sum:", sum)

    // 索引值遍历

    for i, num := range nums {

        if num == 3 {

            fmt.Println("index:", i)

        }

    }

    // map实例 k/v 键值对

    kvs := map[string]string{"a": "apple", "b": "banana"}

    for k, v := range kvs {

        fmt.Println("%s->%s\n", k, v)

    }

    // range 遍历字符unincod码

    for i, c := range "ab" {

        fmt.Println(i, c)

    }

}