How to search multiple file in ftp?

[JeffersonJiao]

I need to get a report like data to get the file that is not on the FTP server. I have the code below but i cannot get the data.

listOfFile =['1.pdf','2.pdf','3.pdf'];
lisfOfNotFound = [];
for(var i=0; i<listOFfile.length;i++){
var c = new Client();
c.on("ready", function() {
console.log(list[0].shipment_id);
for (var i = 0; i < list.length; i++) {
c .get(${list[i]}.pdf,
function(err, data) {
if (err){
lisfOfNotFound.push(list[i])
}
c.end();
}
);
}
});
c.connect(config.ftp);
}