How to remove duplicates from computed observable array in knock out?

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Knockout.js

getting duplicates from when adding new item to the observable computed array and if modified not getting the latest updated values. here is the piece of code.

self.admitDiagnosisList = ko.observableArray();
            ko.computed(function () {
                if (patientContext().Visit) {
                    $.each(patientContext().Visit.AdmitDiagList, function (index, value) {
                        return self.admitDiagnosisList.push(value.DisplayName);
                    });
            }
        });

What I have tried:

if (patientContext().Visit) {
$.each(patientContext().Visit.AdmitDiagList, function (index, value) {
return _uniq((self.admitDiagnosisList.push(value.DisplayName))),this);
});
}

tried to make it unique but not working