JSFiddle - React, Tailwind, and code Playground

JavaScript

var TestObject = function () {
    var a, b;
    this.draw = function (aVal, bVal) {
        a = aVal;
        b = bVal;
    }
    this.update = function () {
        console.info("a = " + a + " | b = " + b);
    }
}

var obj = new TestObject();
obj.update();

obj.draw(3, 4);