使用for迴圈搭配continue Label遍歷slice deps篩選出員工年紀(Employee.Age)都不超過30的Department。
範例環境：
- Go 1.16
main.go
package main
import "fmt"
type Employee struct {
Id int
Name string
Age int
}
type Department struct {
Id int
Name string
Employees []Employee
}
func main() {
deps := []Department{
{
Id: 1,
Name: "HR",
Employees: []Employee{
{Id: 1, Name: "John", Age: 33},
{Id: 2, Name: "Mary", Age: 28},
},
},
{
Id: 2,
Name: "Mkt.",
Employees: []Employee{
{Id: 3, Name: "Bill", Age: 18},
{Id: 4, Name: "Nick", Age: 17},
},
},
}
result := filterDeptAllEmpAgeLessThen30(deps)
fmt.Println(result)
}
func filterDeptAllEmpAgeLessThen30(deps []Department) (result []Department) {
Outer:
for i := 0; i < len(deps); i++ { // outer loop
dep := deps[i]
if dep.Employees != nil && len(dep.Employees) != 0 {
emps := dep.Employees
for j := 0; j < len(emps); j++ { // inner loop
emp := emps[j]
if emp.Age > 30 { // if any employee's age over 30, then drop the dept
continue Outer // continue to Outer loop
}
}
}
result = append(result, dep)
}
return
}
執行印出結果如下，只印出部門編號2(Department.Id: 2)的資料。
[{2 Mkt. [{3 Bill 18} {4 Nick 17}]}]
第一次看到Outer:標註的位置還以為會跳出外面的迴圈，結果是continue到外面的for迴圈繼續執行。
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