Answers for "setState hook"

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react usestate

const [count, setCount] = React.useState(0);
  const [count2, setCount2] = React.useState(0);

  // increments count by 1 when first button clicked
  function handleClick(){
    setCount(count + 1);
  } 

  // increments count2 by 1 when second button clicked
  function handleClick2(){
    setCount2(count2 + 1);
  } 

  return (
    <div>
      <h2>A React counter made with the useState Hook!</h2>
      <p>You clicked {count} times</p>
      <p>You clicked {count2} times</p>
      <button onClick={handleClick}>
        Click me
      </button> 
      <button onClick={handleClick2}>
        Click me2
      </button>
  );

Posted by: Guest on October-26-2021

Source

how to set value in array react hook usestate

const[array,setArray]= useState([
        {id: 1, value: "a string", othervalue: ""},
        {id: 2, value: "another string", othervalue: ""},
        {id: 3, value: "a string", othervalue: ""},
    ])

const updateItem =(id, whichvalue, newvalue)=> {
  var index = array.findIndex(x=> x.id === id);

  let g = array[index]
  g[whichvalue] = newvalue
  if (index === -1){
    // handle error
    console.log('no match')
  }
  else
    setArray([
      ...array.slice(0,index),
      g,
      ...array.slice(index+1)
    ]
            );
}
//how to use the function    
onPress={()=>updateItem(2,'value','ewfwf')}
onPress={()=>updateItem(1,'othervalue','ewfwf')}
/*
the first input of the function is the id of the item
the second input of the function is the atrribute that you wish to change
the third input of the function is the new value for that attribute
It's a pleasure :0
~atlas
*/

Posted by: Guest on August-21-2020

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>
    );
  }
}

Posted by: Guest on March-13-2020

Source

usestate react

import React, { useState } from 'react';

function Example() {
	
  const [count, setCount] = useState(0);
  
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Posted by: Guest on January-24-2021

Source

react useState

//initial state
const [state, setState] = useState(0)
//change state
setState(1)
//change state with prev state value
setState((prevState) => {prevState + 2}) // 3

Posted by: Guest on September-09-2021

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