JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgithub.com/melanke/Watch.JS/master/src/watch.js"></script>

JavaScript

var obj = {
    phrase: "hey",
    name: "buddy",
    alert: function(){
        alert(obj.phrase + " " + obj.name);
    },
    alert2: function(){
        alert(obj.name + ", " + obj.phrase);
    }
}
    
watch(obj, "name", obj.alert);
watch(obj, "name", obj.alert2);

obj.name = "johnny";

unwatch(obj, "name", obj.alert);

obj.name = "phil";