“useeffect gancho” Respostas de código

useeffect UMNount

  useEffect(() => {
    return () => {
      console.log("cleaned up");
    };
  }, []);
Dark Dotterel

Useeffect com limpeza

  useEffect(() => {
	//your code goes here
    return () => {
      //your cleanup code codes here
    };
  },[]);
Tense Trout

Reacta useeffect

import React, { useEffect } from 'react';

export const App: React.FC = () => {
  
  useEffect(() => {
        
  }, [/*Here can enter some value to call again the content inside useEffect*/])
  
  return (
    <div>Use Effect!</div>
  );
}
DonsWayo

useeffect

import React, { useState, useEffect } from 'react';
function Example() {
  const [count, setCount] = useState(0);

  useEffect(() => {    document.title = `You clicked ${count} times`;  });
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}
Muddy Mamba

Exemplo de reação de uso do EFEFECT

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

function Reddit() {
  // Initialize state to hold the posts
  const [posts, setPosts] = useState([]);

  // effect functions can't be async, so declare the
  // async function inside the effect, then call it
  useEffect(() => {
    async function fetchData() {
      // Call fetch as usual
      const res = await fetch(
        "https://www.reddit.com/r/reactjs.json"
      );

      // Pull out the data as usual
      const json = await res.json();

      // Save the posts into state
      // (look at the Network tab to see why the path is like this)
      setPosts(json.data.children.map(c => c.data));
    }

    fetchData();
  }); // <-- we didn't pass a value. what do you think will happen?

  // Render as usual
  return (
    <ul>
      {posts.map(post => (
        <li key={post.id}>{post.title}</li>
      ))}
    </ul>
  );
}

ReactDOM.render(
  <Reddit />,
  document.querySelector("#root")
);
Akmal

useeffect gancho

import {useEffect, useState} from 'react';

export default function App() {
  const [counter, setCounter] = useState(0);


  // ✅ hook is called at top level (not conditionally)
  useEffect(() => {
    if (counter > 0) {
      console.log('hello world');
    }
  });

  return (
    <div>
      <button onClick={() => setCounter(counter + 1)}>toggle loading</button>
      <h1>Hello world</h1>
    </div>
  );
}
Vivacious Vulture

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