javascript - Compare the elements of two arrays by Id and remove the elements from the one array that are not presented in the other

Question

I have two arrays of objects like this:

var arr1 = [{Id: 1, Name: "Test1"}, {Id: 2, Name: "Test2"}, {Id: 3, Name: "Test3"}, {Id: 4, Name: "Test4"}]

var arr2 = [{Id: 1, Name: "Test1"}, {Id: 3, Name: "Test3"}]

I need to compare the elements of the two arrays by Id and remove the elements from arr1 that are not presented in arr2 ( does not have element with that Id). How can I do this ?

Answer 1

var res = arr1.filter(function(o) {
    return arr2.some(function(o2) {
        return o.Id === o2.Id;
    })
});

shim, shim, shim.