I've recently come across the const keyword in JavaScript. From what I can tell, it is used to create immutable variables, and I've tested to ensure that it cannot be redefined (in Node.js):  const x = 'const'; const x = 'not-co...

Why should objects in Redux be immutable? I know that some frameworks such as Angular2 will use onPush and can take advantage of immutability to compare states of views for faster rendering, but I am wondering if there are other reasons as Redux is f...

I have built my first React application with stateful stores the "normal" way, and now I am looking into using an immutable global state like used in the Este starterkit.   The state of all stores is kept together in a single immutable data s...

I have an issue with updating the immutable redux and quite nested data. Here's an example of my data structure and what I want to change. If anyone could show me the pattern of accessing this update using ES6 and spread operator I would be thank...

I wonder how to contact array that is immutable. Lets imagine I start with array list = [4,1], and then I receive array from action response like so items = [5,2,6]. How do I concant arrays that the result is [4,1,5,2,6] and that operation is not mut...

I am adhering to strict functional programming principles with no mutation.  How can I write something like the below code in a way that doesn't mutate the greeting variable, and without returning it within each if block?  const greet = (name, ti...

I'm still learning React and working on coding John Conway's Game of Life. I have created a game board for the game using a 2D array in state. I have this 2D array stored in state in my App.js. I also have two functional components, Gameboard...

I would like to sort immutable.js orderedList by property name,   data.map(x => x.get("name")) returns the string, I want to sort my map by name in alphabetical order.  How to do that? I tried:   return data.sortBy((val) => {     if (di...

Suppose I have the following Records defined using Immutable.js:  var Address = Immutable.Record({street: '', city: '', zip: ''}); var User = Immutable.Record({name: '', address: new Address()});   How do I convert pla...

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...