Get the current user in drupal 8

http://www.drupal8.ovh/en/tutoriels/56/get-current-user-drupal-8

Question

• How to get the current user, user ID, user data on drupal 8 ?
• How To check if the current page is the homepage of Drupal 8 ?

Example:

    //use Drupal\user\Entity\User;
    $userCurrent = \Drupal::currentUser();
    $user = \Drupal\user\Entity\User::load($userCurrent->id());
    $name = $user->getUsername();

How To check if the current page is the homepage in Drupal 8

As drupal_is_front_page() on drupal 7, you can use path.matcher service of drupal 8.
Example:
$is_front_page = \Drupal::service('path.matcher')->isFrontPage();