Całkowicie usuń duplikat elementu z tablicy

var array = [1, 2, 3, 4, 4, 5, 5],
    result = array.filter(function (v, _, a) {
        return a.indexOf(v) === a.lastIndexOf(v);
    });

console.log(result); // [1, 2, 3]
Delightful Dotterel