Filtering the issues returned from links as SET Follow

Hi,

I am wondering, is there any way how to filter the issues returned from the links as a Set. As there is no filter method on the Set object, I have tried to filter it using the forEach method and adding items that conform the condition to the new Set.

function filterSet(set, condition) {
    var newSet = new Set();
    var iterator = set.entries();
    var iteration = iterator.next();
    while(!iteration.done) {
        if(condition(iteration.value)) {
            newSet.add(iteration.value);
        }
        iteration = iterator.next();
    }
    return newSet;
}

The problem is, calling new Set(); creates an error ReferenceError: "Set" is not defined.

My question is, is there a way to create a new Set object? If not, what is the best way to filter the Set object?