How to check if the logged in user has access to a group in visualforce page

How to check if the logged in user has access to a group in visualforce page

We can check whether the logged-in user has access to a group or not with the below code

Boolean hasUserAccess = false;
List<GroupMember> lstGroupMember = new List<GroupMember>();
lstGroupMember = [select GroupId,group.name, group.DeveloperName from GroupMember where groupId='00G0o000003nffh' and UserOrGroupId=:userInfo.getUserId()];

 if(lstGroupMember.size() >0) {
            hasUserAccess = true;
 }

where '00G0o000003nffh' is the ID of the public group created.

Example:
Apex Class: LoggedInUserGroupAccessController

public class LoggedInUserGroupAccessController {
    public Boolean hasUserAccess {get;set;}
    public LoggedInUserGroupAccessController() {
        hasUserAccess = false;
        List<GroupMember> lstGroupMember = new List<GroupMember>();
        lstGroupMember = [select GroupId,group.name, group.DeveloperName from GroupMember where groupId='00G0o000003nffh' and UserOrGroupId=:userInfo.getUserId()];
        if(lstGroupMember.size() >0) {
            hasUserAccess = true;
        }
    }
}

Visualforce Page: LoggedInUserAccessInVFPage

<apex:page controller="LoggedInUserGroupAccessController">
  <apex:outputPanel rendered="{!if(hasUserAccess == true,true,false)}">Logged In User has access</apex:outputPanel>
</apex:page>

Output: