PropTypes are another enhancement that can be added to components. If a value of the wrong type is supplied to a component, an error will be thrown. propTypes are not a requirement but are very useful for any component to find bugs quicker. Eve demonstrates the syntax for createClass, ES6, and stateless components.
- [Instructor] Another enhancement we can add…to our components is 'PropTypes.'…'PropTypes' allow us to supply a property type…for all of our different properties,…so that it will validate to make sure…that we're supplying the right type.…In this way, 'PropTypes' are a feature,…but also working documentation…about the props that you're using,…and what should be supplied as values.…So let's go ahead and do this…in the three different ways once again.…We're going to start with our 'createClass' component.…Now the 'createClass' component is going to add…another key here called 'PropTypes,'…and 'PropTypes' is going to be set equal to this object.…
Now the object that we're going to use here,…is going to have our property types defined.…So let's set up this for 'total' powder, and backcountry.…We'll say 'PropTypes' dot number,…we'll also use powder…'PropTypes' dot number,…and then we'll use backcountry,…which is yet another number.…So our property types are pretty uniform here,…but you can use this for 'array,'…you can use it for 'functions,'…
- Refactoring elements with JSX
- Transpiling with Babel
- Creating components
- Adding component properties and methods
- Displaying child components
- Working with props and state
- Setting up routes
- Nesting routes
- Creating forms
- Understanding the component life cycle
Skill Level Intermediate
Q: This course was updated on 09/19/2017. What changed?
A: The following topics were updated: setting up Chrome tools for React, inspecting React sites, Babel static transpiling with babel-cli, loading JSON with webpack, adding CSS to webpack build, and creating components with createClass(). In addition, a new video was added that covers migrating to webpack 3.
Q: This course was updated on 06/20/2018. What changed?
A: New videos were added that cover staying up to date with React and using create-react-app. In addition, the following topics were updated: creating components with createClass() and working with state.
Building a Polling App with Socket IO and React.jswith Alex Banks3h 56m Intermediate
1. What Is React.js?
2. Intro to JSX and Babel
3. React Components
4. Props and State
5. Using the React Router
6. Forms and Refs
7. The Component Lifecycle
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