JSFiddle - React, Tailwind, and code Playground

JavaScript

Array.prototype.getUnique = function () {
            var unique = this.filter(function (elem, pos) {
                return this.indexOf(elem) == pos;
            }.bind(this));
            this.length = 0;
            this.splice(0, 0, unique);
        }

        var duplicates = [0, 0, 1, 1, 2, 3, 1, 1, 0, 4, 4];
        duplicates.getUnique();
        alert(duplicates);