update react app
//NPM
npm install --save react@latest
//Yarn
yarn upgrade react@latestupdate react app
//NPM
npm install --save react@latest
//Yarn
yarn upgrade react@latesthow to update react app
//open terminal and run thsi code
cd newreact
//where newreact is the old react app you created
//open package.json in text editor and change the version to latest
//open the same terminal gain and run this
npm installhow to update state in react
// Correct
this.setState(function(state, props) {
return {
counter: state.counter + props.increment
};
});react lifecycle hooks
class Content extends React.Component {
// ...
componentWillMount() {
this.setState({ activities: data });
}
// ...
}how to update state react js
class Car extends React.Component {
constructor(props) {
super(props);
this.state = {
brand: "Ford",
model: "Mustang",
color: "red",
year: 1964
};
}
changeColor = () => {
this.setState({color: "blue"});
}
render() {
return (
<div>
<h1>My {this.state.brand}</h1>
<p>
It is a {this.state.color}
{this.state.model}
from {this.state.year}.
</p>
<button
type="button"
onClick={this.changeColor}
>Change color</button>
</div>
);
}
}Copyright © 2021 Codeinu
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