public &FormStateInterface::getValue($key, $default = NULL)
Returns the submitted form value for a specific key.
string|array $key: Values are stored as a multi-dimensional associative array. If $key is a string, it will return $values[$key]. If $key is an array, each element of the array will be used as a nested key. If $key = array('foo', 'bar') it will return $values['foo']['bar'].
mixed $default: (optional) The default value if the specified key does not exist.
mixed The value for the given key, or NULL.
public function &getValue($key, $default = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormStateInterface.php/function/FormStateInterface::getValue/8.1.x