use 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>
  );
}

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3.75

Awgiedawgie 440220 points

                                      import React, { useEffect } from 'react';
	
	const [data,setData]=useState()
    useEffect(() =&gt; {
        fetch(`put your url/api request in here`)
        .then(res=&gt;res.json())
        .then(json =&gt; setData(json))
    },[])

Thank you! 8

3.75 (8 Votes)

3.71

Phoenix Logan 186120 points

                                      var fruitStateVariable = useState('banana'); // Returns a pair
  var fruit = fruitStateVariable[0]; // First item in a pair
  var setFruit = fruitStateVariable[1]; // Second item in a pair

Thank you! 7

3.71 (7 Votes)

Awgiedawgie 440220 points

                                    class Example extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  render() {
    return (
      &lt;div&gt;
        &lt;p&gt;You clicked {this.state.count} times&lt;/p&gt;
        &lt;button onClick={() =&gt; this.setState({ count: this.state.count + 1 })}&gt;
          Click me
        &lt;/button&gt;
      &lt;/div&gt;
    );
  }
}

Thank you! 10

4 (10 Votes)

3.7

Lionel Aguero 33605 points

                                    function Counter({initialCount}) {
  const [count, setCount] = useState(initialCount);
  return (
    &lt;&gt;
      Count: {count}
      &lt;button onClick={() =&gt; setCount(initialCount)}&gt;Reset&lt;/button&gt;
      &lt;button onClick={() =&gt; setCount(prevCount =&gt; prevCount - 1)}&gt;-&lt;/button&gt;
      &lt;button onClick={() =&gt; setCount(prevCount =&gt; prevCount + 1)}&gt;+&lt;/button&gt;
    &lt;/&gt;
  );
}

Thank you! 10

3.7 (10 Votes)

4.5

Awgiedawgie 440220 points

                                    import React, { useEffect, useState } from 'react';
import ReactDOM from 'react-dom';

function LifecycleDemo() {
  // It takes a function
  useEffect(() =&gt; {
    // This gets called after every render, by default
    // (the first one, and every one after that)
    console.log('render!');

    // If you want to implement componentWillUnmount,
    // return a function from here, and React will call
    // it prior to unmounting.
    return () =&gt; console.log('unmounting...');
  }, [ // dependencies to watch = leave blank to run once or you will get a stack overflow  ]);

  return &quot;I'm a lifecycle demo&quot;;
}

function App() {
  // Set up a piece of state, just so that we have
  // a way to trigger a re-render.
  const [random, setRandom] = useState(Math.random());

  // Set up another piece of state to keep track of
  // whether the LifecycleDemo is shown or hidden
  const [mounted, setMounted] = useState(true);

  // This function will change the random number,
  // and trigger a re-render (in the console,
  // you'll see a &quot;render!&quot; from LifecycleDemo)
  const reRender = () =&gt; setRandom(Math.random());

  // This function will unmount and re-mount the
  // LifecycleDemo, so you can see its cleanup function
  // being called.
  const toggle = () =&gt; setMounted(!mounted);

  return (
    &lt;&gt;
      &lt;button onClick={reRender}&gt;Re-render&lt;/button&gt;
      &lt;button onClick={toggle}&gt;Show/Hide LifecycleDemo&lt;/button&gt;
      {mounted &amp;&amp; &lt;LifecycleDemo/&gt;}
    &lt;/&gt;
  );
}

ReactDOM.render(&lt;App/&gt;, document.querySelector('#root'));

Thank you! 2

4.5 (2 Votes)

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