package main

import "fmt"

func main() {
	nums := []int{2, 3, 4}
	sum := 0
	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"}
	for k, v := range kvs {
		fmt.Printf("%s -> %s\n", k, v)
	}
	
	for k := range kvs {
		fmt.Println("key:", k)
	}

	for i,c := range "go" {
		fmt.Println(i,c)
	}
}