How to check if a file exists in Documents folder?

let documentsURL = try! FileManager().url(for: .documentDirectory,
                                          in: .userDomainMask,
                                          appropriateFor: nil,
                                          create: true) 
let fooURL = documentsURL.appendingPathComponent("foo.html")
let fileExists = FileManager().fileExists(atPath: fooURL.path)
if fileExists==true
{
print("already existed")
}
else
{
print("no file")
}

https://stackoverflow.com/questions/1638834/how-to-check-if-a-file-exists-in-documents-folder