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# React Cheatsheet ## Unique Features - JavaScript library for building user interfaces - Component-based architecture - Virtual DOM - JSX syntax - React Router - Redux ## Components
// Define a component
function ComponentName(props) {
// Component body
return (
<div>{props.property}</div>
);
}
// Render a component
ReactDOM.render(<ComponentName property="value" />, document.getElementById('root'));
## State
// Define state in a class component
class ComponentName extends React.Component {
constructor(props) {
super(props);
this.state = { property: value };
}
render() {
return (
<div>{this.state.property}</div>
);
}
}
// Update state
this.setState({ property: new_value });
## Props
// Pass props to a component
<ChildComponent property={value} />
// Access props in a component
function ChildComponent(props) {
return (
<div>{props.property}</div>
);
}
## Routing
// Define routes
<Router>
<Switch>
<Route exact path="/" component={Home} />
<Route path="/about" component={About} />
</Switch>
</Router>
// Navigate to a route
<Link to="/about">About</Link>
## Redux
// Define a store
const store = createStore(reducer);
// Define a reducer
function reducer(state = initialState, action) {
switch (action.type) {
case 'ACTION_TYPE':
return { ...state, property: new_value };
default:
return state;
}
}
// Dispatch an action
store.dispatch({ type: 'ACTION_TYPE', payload: data });
// Connect a component to the store
function mapStateToProps(state) {
return { property: state.property };
}
export default connect(mapStateToProps)(ComponentName);
## Resources - [React Documentation](https://reactjs.org/docs/getting-started.html) - [React tutorial](https://reactjs.org/tutorial/tutorial.html) - [React hooks](https://reactjs.org/docs/hooks-intro.html) - [React router](https://reactrouter.com/web/guides/quick-start) - [React Redux](https://redux.js.org/introduction/getting-started)