來源：https://github.com/xg-wang/gobyexample/tree/master/examples
package main
import "fmt"
func main() {
nums := []int{2, 3, 4}
sum := 0
for _, num := range nums {
sum += num
}
fmt.Println("sum:", sum)
//`range`在數(shù)組和slice中提供對每項(xiàng)的索引和值的訪問
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)
}
//`range`也可以只遍歷map的鍵
for k := range kvs {
fmt.Println("key:", k)
}
//`range`在字符串中迭代 unicode碼點(diǎn)(code point)
//第一個返回值是字符的起始字節(jié)位置牍颈，然后第二個是字符本身
for i, c := range "go" {
fmt.Println(i, c)
}
}
輸出結(jié)果:
sum: 9
index: 1
b -> banana
a -> apple
key: a
key: b
0 103
1 111
