Skip to Content
Serverless Web Applications with React and Firebase
book

Serverless Web Applications with React and Firebase

by Mayur Tanna, Harmeet Singh
April 2018
Intermediate to advanced content levelIntermediate to advanced
284 pages
6h 43m
English
Packt Publishing
Content preview from Serverless Web Applications with React and Firebase

The constructor() method

The constructor method of React Component gets invoked first when the component is mounted. Here, we can set the state of the component.

Here's an example of constructor in React.Component:

constructor(props) { super(props); this.state = { value: props.initialValue }; }
Using this.props inside the constructor, we need to call super(props) to access and call functions of parents; otherwise, you will get this.props undefined in the constructor because React sets the .props on the instance from outside immediately after calling constructor, but it will not affect when you are using this.props inside the render method.
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Building Web Applications with Firebase

Building Web Applications with Firebase

Gareth Brown
React Native in Action

React Native in Action

nader dabit, Nickie Buckner

Publisher Resources

ISBN: 9781788477413Supplemental Content