"react usestate" Code Answer's
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react usestate
import React, { useState } from 'react';
function Example() {
// Declare a new state variable, which we'll call "count"
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
Source: reactjs.org
prevstate in usestate
const [prevState, setState] = React.useState([]);
setState(prevState => [...prevState, 'somedata'] );
state with react functions
class Example extends React.Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
}
render() {
return (
<div>
<p>You clicked {this.state.count} times</p>
<button onClick={() => this.setState({ count: this.state.count + 1 })}>
Click me
</button>
</div>
);
}
}
Source: reactjs.org
functional component react with state
import React, { useState } from 'react';
function Example() {
// Declare a new state variable, which we'll call "count" const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
Source: reactjs.org
usestate hook
import React, { useState } from 'react';
function Example() {
// Declare a new state variable, which we'll call "count"
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
Source: reactjs.org
react usestate
function Counter({initialCount}) {
const [count, setCount] = useState(initialCount);
return (
<>
Count: {count}
<button onClick={() => setCount(initialCount)}>Reset</button>
<button onClick={() => setCount(prevCount => prevCount - 1)}>-</button>
<button onClick={() => setCount(prevCount => prevCount + 1)}>+</button>
</>
);
}
Source: tr.reactjs.org
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