检查另一个数组后如何为数组添加值

Question

I have two arrays as such :

UserGroupUser[{Id:"1",UserId:"2",UserGroupId"1"},
           {Id:"2",UserId:"3",UserGroupId"1"},
            {Id:"3",UserId:"4",UserGroupId"2"}]

UserGroupId will have values such as 1, 2, 3 etc.

Employee[{EmployeeId:"1", EmpName:"John", Email:"john@example.com"},
       {EmployeeId:"2", EmpName:"Mary", Email:"Mary@example.com"},
         {EmployeeId:"3", EmpName:"Sarah", Email:"Sarah@example.com"},
         {EmployeeId:"4", EmpName:"Jake", Email:"Jake@example.com"}   ]

I will store a number in a variable GroupId such as GroupId=1 and what i want to do is check the UserGroupUser table if GroupId 1 matches any rows for key UserGroupId and if there is a match for every UserId the corresponding EmployeeId in Employee table that matches would mean i add a new element called enrolled=true. else if there is not match add a element to Employee enrolled=false .

for eg:

If GroupId is =1 then i want to get the userId of those with the UserGroupId as 1 in the UserGroupUser array and add enrolled:true into the Employee array EmployeeId to those corresponding to the UserId .

This is how i tried to do it..

 UserGroupUser.forEach(function (arrayItem) {
                    if (arrayItem.UserGroupId === GroupId) {
                        result = Employee.map(function (a, index, array) {
                            while (arrayItem.UserId === a.EmployeeNo) {

                                a.enrolled = true;
                            }

                            return a;
                        }
                        );
                    }
                    else {
                        result = Employee.map(function (a, index, array) {
                            a.enrolled = false;
                            return a;
                        }
                        );

                    }
                });

what am i doing wrong? how should i do this?

Answer 1

Try this

var userGroup = [{Id:"1",UserId:"2",UserGroupId:"1"},
           {Id:"2",UserId:"3",UserGroupId:"1"},
            {Id:"3",UserId:"4",UserGroupId:"2"}]

var employees = [{EmployeeId:"1", EmpName:"John", Email:"john@example.com"},
       {EmployeeId:"2", EmpName:"Mary", Email:"Mary@example.com"},
         {EmployeeId:"3", EmpName:"Sarah", Email:"Sarah@example.com"},
         {EmployeeId:"4", EmpName:"Jake", Email:"Jake@example.com"}   ]

employees.forEach(function(item){
        var found = userGroup.filter(i=>i.UserId==item.Id);
        if(found.length>0)
            item.enrolled = true
        else
            item.enrolled = false
})

console.log(employees);

the employees then will contained the enrolled or not try this in your console too

Answer 2

The problem with your code is that when if (arrayItem.UserGroupId === GroupId) { is executed, it changes enrolled to true for the concerned employees but when the else part of this check is executed, it overrides the changes made by the if condition part. Try this.

UserGroupUser = [{Id:"1",UserId:"2",UserGroupId:"1"},
             {Id:"2",UserId:"3",UserGroupId:"1"},
             {Id:"3",UserId:"4",UserGroupId:"2"}];
Employee = [{EmployeeId:"1", EmpName:"John", Email:"john@example.com"},
        {EmployeeId:"2", EmpName:"Mary", Email:"Mary@example.com"},
        {EmployeeId:"3", EmpName:"Sarah", Email:"Sarah@example.com"},
        {EmployeeId:"4", EmpName:"Jake", Email:"Jake@example.com"}];
GroupId = "1";
Employee.map(function (emp) {
  emp.enrolled = false;
});
UserGroupUser.forEach(function (arrayItem) {
  if (arrayItem.UserGroupId === GroupId) {
    Employee.map(function (emp) {
      if (arrayItem.UserId === emp.EmployeeId) {
        emp.enrolled = true;
      }
    });
  }
});
console.log(Employee);