go语言范围(range) go语言中range关键字用于for循环中迭代数组(array)、切片(slice)、通道(channel)或集合(map)的元素, 在数据和切片中它返回元素的索引和索引对应的值,在集合中返回key-value对 eg:
package main
import "fmt"
func main() {
nums := []int{1,2,3}
sum := 0
for _, num := range nums {
sum += num
}
fmt.Println("sum:",sum)
for i, num :=range nums {
if num == 3 {
fmt.Println("index:",i)
}
}
//range也可以用在map的键值对上
kvs := map[string]string{"a": "apple", "b": "banana"}
for k, v := range kvs {
fmt.Printf("%s -> %s\n", k, v)
}
for i, c := range "go" {
fmt.Println(i, c)
}
}
% go run 1.4、go语言语句.go
sum: 6
index: 2
a -> apple
b -> banana
0 103
1 111