I can take a Javascript object o and create a new Proxy object from it:  let p = new Proxy(object, { ... })   But is there a way to mutate an existing object reference to track changes on the original object? In particular, is there a way I can track...

Is there any elegant way of removing an object from an array which is part of an array? I have been working with React and Redux for a while now but get stuck several hours everytime I have to remove or insert data without mutating the state.  The re...

I am in need of a way to detect if any DOM Node/Element has been removed or modified and instantly restore that element to the state in which it was before.  I tried to "backup" the body node and set the body.innerHTML to its original state e...

if objects are mutable by default why in this case it dosen't work? How to make mutation  value of the key "a" in the object "s"?    var s = {   a: "my string" };  s.a[0] = "9"; // mutation console.log(s.a); // doe...

I know that Reducers are just pure functions that take the previous state and an action, and return a new state objects, instead of mutating the previous state. But although direct mutations are not Redux's philosophy, it's still possible (or...

n00b question here:  Suppose you call a function that updates a number or string like this  var x = "well"; var helloify = function(str){   str += "hello" };   I'd expect this behavior:  helloify(x); console.log(x) \\ "well he...

After the user clicks a button I want to replace the data in my vuex store with the data from my local object. But I am stuck at the mutation. Here is some code for more details.  This is the method that is called after the user clicks a button. (thi...

let records = {   2018: {     Jan: {       records: [{          id: 123,          date: '01-Jan-2018',          amount: 300,         type: 'expense'        }],       totalExpenses: 300,       totalIncome: 0     },     Feb: {       r...

When you look at this excerpt of "An Elm introduction":  subscriptions : Model -> Sub Msg subscriptions model =   Time.every 1000 Tick   The model parameter passed to the function subscriptions must correspond to the current model of the a...

I have this contentEditable code:    function uuid() { // to generate uuid   return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =>     (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)   ) }  // ---------...