Getting Current User Permission in list Item

//Common Method for Getting Current User Permission in list Item

//Parameters Required
//1)AppwebUrl
//2)HostWebUrl
//3)ListName
//4)Listem Id
//5)Callback

//for calling function use GetItemPermissions({AppwebUrl},{HostWebUrl},{ListName},{Listem Id},function(data){
//alert(data);
//});

//sample
//GetItemPermissions(SPAppWebUrl,SPHostUrl,"Save List",41,function(data){
//alert(data);
//});


 
    function getListUserEffectivePermissions(AppWebUrl, HostURL, listTitle, accountName, ItemID, callback) {
        var endpointUrl = AppWebUrl + "/_api/SP.AppContextSite(@target)/web/lists/getbytitle('" + listTitle + "')/items(" + ItemID + ")/getusereffectivepermissions(@u)?@u='" + encodeURIComponent(accountName) + "'&@target='" + HostURL + "'";
        $.getJSON(endpointUrl).done(function(data) {
            callback(data);
        }).fail(function(data) {
            console.log(data);
            callback("error")
        });
    }

    function parseBasePermissions(value) {
        var permissions = new SP.BasePermissions();
        permissions.initPropertiesFromJson(value);
        var permLevels = [];
        for (var permLevelName in SP.PermissionKind.prototype) {
            if (SP.PermissionKind.hasOwnProperty(permLevelName)) {
                var permLevel = SP.PermissionKind.parse(permLevelName);
                if (permissions.has(permLevel)) {
                    permLevels.push(permLevelName);
                }
            }
        }
        return permLevels;
    }

    function GetItemPermissions(AppWebUrl, HostURL, ListName, ItemID, callback) {
        $.getJSON(AppWebUrl + "/_api/SP.AppContextSite(@target)" + "/web/currentuser?@target='" + HostURL + "'").done(function(data) {
            Email = data.LoginName;
            getListUserEffectivePermissions(AppWebUrl, HostURL, ListName, Email, ItemID, function(data) {
                if (data != "error") {
                    var roles = parseBasePermissions(data);                   
                    callback(roles);
                } else {
                    callback("Error");
                }
            });
        }).fail(function(data) {
            console.log(data);
            callback("Error");
        });
    }