“reagieren usw.” Code-Antworten

Vorstaat im Usestate

const [prevState, setState] = React.useState([]);

setState(prevState => [...prevState, 'somedata'] );
Salo Hopeless

React 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

reagieren usw.

// Initialize useState.
const [stateVar, setStateVar] = useState();

// The useState parameters define the default value of stateVar.
useState(); // stateVar === undefined
useState(true); // stateVar === true
useState('Hamburger'); // stateVar === 'Hamburger'

// setStateVar is a function that sets the value of stateVar.
setStateVar(value);

// stateVar is equal to the value that was set in the setStateVar-function.
stateVar

/* 
Example usage - Everytime you run toggleActive, the isActive
variable will toggle between false and true.
*/
const [isActive, setIsActive] = useState(false);

function toggleActive() {
	setIsActive(!isActive);
}
9gram panter

React UsSestate Hook

import { useState } from "react"
naly moslih

ussten

function ExampleWithManyStates() {
  const [age, setAge] = useState(42);
  const [fruit, setFruit] = useState('banana');
  const [todos, setTodos] = useState([{ text: 'Learn Hooks' }]);
dev_ade

in reagieren

function handleOrangeClick() {
    // Similar to this.setState({ fruit: 'orange' })
    setFruit('orange');
  }
Cautious Cottonmouth

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