const list =["17","17","18","19","20","50","50"];


class App extends React.Component {

    constructor(){
    super();

    this.state = {
      list: list
    };
this.func = this.func.bind(this);
}


func (list) {


  this.setState({ list: 40 });
 }

render(){



  return(
      <div>
        {list}
        <button onClick={()=> this.func(list)} type="button">Dismiss</button>
        <div> {list}</div>
    </div>
  )}

}