FrontendUser::hasRole() 

\nn\t3::FrontendUser()->hasRole($roleUid); 

Checks whether the user has a specific role.

\nn\t3::FrontendUser()->hasRole( $roleUid );
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@param $role
@return bool

Source Code 

public function hasRole($roleUid)
{
	if (!$this->isLoggedIn()) return false;
	$userGroupsByUid = $this->getCurrentUserGroups();
	return $userGroupsByUid[$roleUid] ?? false;
}
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