Answers for "modify state react"

1

how to define state in react function

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>
  );
}
Posted by: Guest on September-21-2020
1

react change state

// React change state
this.setState({state to change:value});
Posted by: Guest on January-09-2021
0

change state in react

import React, {Component} from 'react';

class ButtonCounter extends Component {
  constructor() {
    super()
    // initial state has count set at 0
    this.state = {
      count: 0
    }
  }

  handleClick = () => {
    // when handleClick is called, newCount is set to whatever this.state.count is plus 1 PRIOR to calling this.setState
    let newCount = this.state.count + 1
    this.setState({
      count: newCount
    })
  }

  render() {
    return (
      <div>
        <h1>{this.state.count}</h1>
        <button onClick={this.handleClick}>Click Me</button>
      </div>
    )
  }
}

export default ButtonCounter
Posted by: Guest on January-12-2021
1

how to update state in react

// Correct
this.setState(function(state, props) {
  return {
    counter: state.counter + props.increment
  };
});
Posted by: Guest on May-09-2021

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