GO语言本身是值传递，先给结论，再看case.
标量类型是赋值是值传递，如int float string
数组和结构体赋值也是值传递，如[2]string struct{}
指针赋值也是值传递，只不过传递的是地址而已
map和slice赋值是引用传递，如map[string][string] []string
字符串遍历，得到值是字符，索引是不连续的。如下
标量类型
func TestInt(t *testing.T) {
num1 := 123
num2 := num1
num1 = 456
fmt.Println("num1", num1) // num1 456
fmt.Println("num2", num2) // num2 123
}
func TestString(t *testing.T) {
str1 := "ccb"
str2 := str1
str1 = "ccb1"
fmt.Println("str1", str1) // str1 ccb1
fmt.Println("str2", str2) // str2 ccb
}数组
func TestArray(t *testing.T) {
arr1 := [2]string{"ccb", "123"}
arr2 := arr1
arr1[0] = "ccb1"
arr2[1] = "1234"
fmt.Println("arr1", arr1) // arr1 [ccb1 123]
fmt.Println("arr2", arr2) // arr2 [ccb 1234]
}结构体
func TestStruct(t *testing.T) {
type P struct {
Name string
Pass string
Maps map[string]string
}
p1 := P{
Name: "ccb",
Pass: "123",
Maps: map[string]string{
"key": "val",
},
}
p2 := p1
p1.Name = "ccb1"
p2.Maps["key"] = "val1"
p2.Pass = "1234"
fmt.Println("p1", p1) // p1 {ccb1 123 map[key:val1]}
fmt.Println("p2", p2) // p2 {ccb 1234 map[key:val1]}
}Map
func TestMap(t *testing.T) {
map1 := make(map[string]string, 2)
map1["name"] = "ccb"
map1["pass"] = "123"
map2 := map1
map1["name"] = "ccb1"
map2["pass"] = "1234"
fmt.Println("map1", map1) // map1 map[name:ccb1 pass:1234]
fmt.Println("map2", map2) // map2 map[name:ccb1 pass:1234]
}数组遍历
func TestString(t *testing.T) {
str := "abc中文"
fmt.Println("len(str)=", len(str))
for i, c := range str {
fmt.Printf("%v : %v\n", i, string(c))
}
}
输出
len(str)= 9
0 : a
1 : b
2 : c
3 : 中
6 : 文