I am trying to update the set the states onClick method 
constructor(props) {
  super(props);
  this.state = {
     from: 'a',
     to: 'b',
  };
  this.previousClick = this.previousClick.bind(this);
}
previousClick() {    
  var currDate = '1';
  let toDate = '2';
  console.log(currDate, toDate);
  this.setState = ({
    from: this.currDate,
    to: this.toDate,
  });
  console.log(this.state);
}
It is still showing the 'a' and 'b'
 
    