Question

我有一个包含student objects的数组和另一个包含goodStrudentId的数组。我需要按照students的顺序从goodStrudentId数组中获取所有学生对象。使用多个forloop我可以解决这个问题，但我想学习解决这个问题的最佳方法。我唯一的问题是遵循goodStrudentId的顺序。以下是了解我的问题的示例代码 -

class Student {
    var s_id : String
    var s_name : String
    init(i: String, n: String) {
        self.s_id = i;
        self.s_name = n;
    }
}

var students = [Student(i: "1",n: "a"),
                Student(i: "2",n: "b"),
                Student(i: "3",n: "c"),
                Student(i: "4",n: "d"),
                Student(i: "5",n: "e")]

var goodStudentsId = ["5","2"]

var goodStudentObject = getGoodStudentObjectUsingId(students:students, gdStudentsId:goodStudentsId)



/*
 Expected answer:
 var goodStudentObject = [Student(i: "5",n: "e"), Student(i: "2",n: "b")]

 */

func getGoodStudentObjectUsingId(students:Array<Student>, gdStudentsId:Array<String>) -> Array<Student>! {
    /*?????? please complete this func*/
    return [];
}

Answer 1

func getGoodStudentObjectUsingId(students:[Student], gdStudentsId:[String]) -> [Student] {
    return students.filter {
        gdStudentsId.contains($0.s_id)
    }
}

Swift：过滤数组的最佳方法

1 个答案: