Compare two lists and update value one list value to other angular5

Question

I have two list of objects

List1: TotalEmployers-

 [{EmployerId: 1,Name:"Rick", Checked :false}, {EmployerId: 2,Name:"John", Checked :false},{EmployerId: 3,Name:"Maddy", Checked :false}]

List2: UpdatedEmployer

[{EmployerId: 1,Name:"Rick"},{EmployerId: 2,Name:"John"}]

How to update list1 checked value to true based on records in list2

Final output :

List1: TotalEmployers-

[{EmployerId: 1,Name:"Rick", Checked :true}, {EmployerId: 2,Name:"John", Checked :true},{EmployerId: 3,Name:"Maddy", Checked :false}]

Answer 1

This might be the most compact code:

TotalEmployers.forEach(x => {
   x.Checked = UpdatedEmployer.some(y => y.EmployerId === x.EmployerId);
});

Answer 2

Try map operator:

TotalEmployers.map(employee=> {
   return employee.Checked = UpdatedEmployer.some(cobay => cobay.EmployerId=== employee.EmployerId);
});

Here is a snippet for your case :

TotalEmployers = [{EmployerId: 1,Name:"Rick", Checked :false}, {EmployerId: 2,Name:"John", Checked :false},{EmployerId: 3,Name:"Maddy", Checked :false}];

UpdatedEmployer = [{EmployerId: 1,Name:"Rick"},{EmployerId: 2,Name:"John"}];




TotalEmployers.map(employee=> {
   return employee.Checked = UpdatedEmployer.some(cobay => cobay.EmployerId=== employee.EmployerId);
});


console.log(TotalEmployers);