Answers for "setstate prevstate"

2

prevstate in usestate

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

setState(prevState => [...prevState, 'somedata'] );
Posted by: Guest on June-09-2020
5

how to use setstate

class App extends React.Component {

state = { count: 0 }

handleIncrement = () => {
  this.setState({ count: this.state.count + 1 })
}

handleDecrement = () => {
  this.setState({ count: this.state.count - 1 })
}
  render() {
    return (
      <div>
        <div>
          {this.state.count}
        </div>
        <button onClick={this.handleIncrement}>Increment by 1</button>
        <button onClick={this.handleDecrement}>Decrement by 1</button>
      </div>
    )
  }
}
Posted by: Guest on April-27-2020
0

prevstate in react

handleClick() {
        this.setState(prevState => {
            return {
                count: prevState.count + 1
            }
        })
    }
Posted by: Guest on May-06-2020
1

this.setstate prevstate

this.setState(prevState => ({ n: !prevState.n }))
Posted by: Guest on January-25-2021

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