how to get previous route react router dom code example

Example 1: react router last page

import { useHistory } from "react-router-dom";

function demo () {
    let history = useHistory();
    const goToPreviousPath = () => {
        history.goBack()
    }
    return (
      <div>
        <Button
          onClick={goToPreviousPath}
        >
          Back
        </Button>
      </div>
    ):
}

Example 2: props history

class Comp extends React.Component {
  componentDidUpdate(prevProps) {
    // will be true
    const locationChanged =
      this.props.location !== prevProps.location;

    // INCORRECT, will *always* be false because history is mutable.
    const locationChanged =
      this.props.history.location !== prevProps.history.location;
  }
}

<Route component={Comp} />;

Example 3: props history

{
  key: 'ac3df4', // not with HashHistory!
  pathname: '/somewhere',
  search: '?some=search-string',
  hash: '#howdy',
  state: {
    [userDefined]: true
  }
}