Get Current User Permission in Sharepoint Online Uisng REST API

function getCurrentUserPermission(userId) {
    $.ajax
    ({
        url: _spPageContextInfo.webAbsoluteUrl + "/_api/web/GetUserById(" + userId + ")/Groups",
        type: "GET",
        headers: {
            "accept": "application/json;odata=verbose",
        },
        dataType: "json",
        async: true,
        success: function (data) {
            /* get all group's title of current user. */
            for (var i = 0; i < data.d.results.length; i++) {
                if (data.d.results[i].Title == "Users") {
                    groupName = data.d.results[i].Title
                }
                else if (data.d.results[i].Title == "Admin") {
                    groupName = data.d.results[i].Title;
                   
                }
                else if (data.d.results[i].Title == "Operation") {
                    groupName = data.d.results[i].Title;
                  }
            }
        }
    });
}

Create Group Using SharePoint 2013 REST API

function createSharepointGroup() {
    var groupName = [];
    groupName.push({ title: 'Admin', desc: "Admin Groups users in this group has full rights" });
    groupName.push({ title: 'Operation', desc: "Operation Group" });
    groupName.push({ title: 'Users', desc: "Users Group" });
    for (var i = 0; i < groupName.length; i++) {
        var spGroup = {
            "__metadata": {
                "type": "SP.Group"
            },
            "Title": groupName[i].title,
            "Description": groupName[i].desc,
        };

        $.ajax({
            url: _spPageContextInfo.webAbsoluteUrl + "/_api/Web/SiteGroups",
            type: "POST",
            contentType: "application/json;odata=verbose",
            data: JSON.stringify(spGroup),
            headers: {
                "Accept": "application/json;odata=verbose",
                "X-RequestDigest": $("#__REQUESTDIGEST").val()
            },
            success: function (data) {
                //success(data);
            },
            error: function (data) {
                //failure(data);
            }
        });
    }

}