What is the difference between constructor and getInitialState?

You should initialize state in the constructor when using ES6 classes, and getInitialState() method when using React.createClass().

Using ES6 classes:

class MyComponent extends React.Component {
constructor(props) {
this.state = {
/* initial state */

Using React.createClass():

const MyComponent = React.createClass({
getInitialState() {
return {
/* initial state */

Note: React.createClass() is deprecated and removed in React v16. Use plain JavaScript classes instead.

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Made by Michael Sakhniuk