Check if string is int
As you said, you can use strconv.Atoi for this.
if _, err := strconv.Atoi(v); err == nil {
fmt.Printf("%q looks like a number.\n", v)
}
You could use scanner.Scanner (from text/scanner) in mode ScanInts, or use a regexp to validate the string, but Atoi is the right tool for the job.
this is better, you can check for ints upto 64 ( or less ) bits
strconv.Atoi only supports 32 bits
if _, err := strconv.ParseInt(v,10,64); err == nil {
fmt.Printf("%q looks like a number.\n", v)
}
try it out with v := "12345678900123456789"