jonidelv

// Codesandbox of example working https://codesandbox.io/s/react-playground-forked-cmqx5d?file=/index.js:0-5046

import React, { useState, useCallback, useEffect, useMemo } from "react";
import ReactDOM from "react-dom";
import "./styles.css";

const httpPatch = (url, data) => {
  return new Promise((resolve) => {
    setTimeout(() => {
      alert(`Patching ${url} with data: ${JSON.stringify(data)}`);

jonidelv

Computed Properties in React

Achieving Computed Properties the right way

React does not have computed properties out of the box like others frameworks do (Ember, Vue, etc.) so, how can we achieve this behaviour the right way ? The most common practice is to "compute" things in the render method if is a class component or just in the body if is a function component.

jonidelv

Controlled and Uncontrolled components

Two different ways to handle input components

When working on a React form you will need to handle difernet types of inputs, selects, textareas, etc. What is the best way to deal with state changes?

Controlled components

jonidelv

React Portals

What are Portals? how and when to use it

React v16 introduced a new feature called portals. Portals provide a quick and easy way to render children into a DOM node that exists outside the DOM hierarchy of the parent component. React render the entire app under a single DOM node — the app root. But what if you want to render children outside the root DOM node? that's when you use Portals.

When

jonidelv

Spread attributes and Destructuring props in Components

How to use Spread attributes and Destructuring props in React Components

These are common Javascript patterns but what is the "right way" to use them with React specially in JSX.

Destructuring

Destructuring was added back in 2015. So you migt be familiar by now

jonidelv

Refs, React and Redux

How to use Refs on diferentes escenarios and what to do when handling connected components to Redux

When working on a React & Redux project when have 3 diferents escenarios when using refs. But first...

What is it ?

Refs are a way of storing references to an object, these refenrences can be DOM nodes or class components. It provide

jonidelv

React Events

Things to take into account when working with events in React

When working with DOM events, we have to take care of React's event pooling. Let's explain better what it is: React use a cross-browser wrapper around the browser’s native events called SyntheticEvent. With this wrapper events work identically across all browsers.

Event Pooling

jonidelv

Redux Store

Best way to create the Redux store if we want to consume it from any JS file

When creating the store in a React-redux app there are differents ways to doit, here is the simple one that allow you to consume the sotre from anywhere. What I mean by that is be able to see the store, dispatch actions and even suscribe to changes from any JS file outside React.

Creating the Store

jonidelv

Why do we use the constructor in React ES6 class components ?

Basically for 2 things:

• For initialize our state with data (sometimes data that is passed through props).
• For biding methods (which you shouldn't be doing, because of the new ES6 arrow function that don't create a new scope, so the this is "already binded").
  

What if I tell you that using the constructor is not longer necessary because of this class proposal that at the moment is in stage 3.

jonidelv

Fragments in React

How to use React.Fragment or its shorthand <> to prevent the use of divs

In React, components could only display a single element that could contain other elements. So you colud't do this.

const MyName = props => {
  return (
    <h1>{props.name}</h1>
    <h2>{props.lastName}</h2>