version

var v1 = "v1.1.0"
var v2 = "1.0.4"
var invalid = ".1.0"

vers1, err := Parse(v1)

if err != nil {
	fmt.Printf("could not parse version %q", v1)
}

vers2, err := Parse(v2)

if err != nil {
	fmt.Printf("could not parse version %q", v1)
}

if vers2.Less(*vers1) {
	fmt.Printf("version %s < version %s\n", vers2, vers1)
}

vers2.Minor = 1

if vers1.Less(*vers2) {
	fmt.Printf("version %s < version %s\n", vers1, vers2)
}

last := Versions{vers1, vers2}.Sort().Last()

fmt.Printf("last version is %s\n", last)

_, err = Parse(invalid)

if err != nil {
	fmt.Printf("could not parse version %q", invalid)
}

Output:
version 1.0.4 < version 1.1.0
version 1.1.0 < version 1.1.4
last version is 1.1.4
could not parse version ".1.0"