test functions
func IsLetter1(s string) bool {
for _, r := range s {
if !unicode.IsLetter(r) {
return false
}
}
return true
}
func IsLetter2(s string) bool {
for _, r := range s {
if (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') {
return false
}
}
return true
}
var IsLetter3 = regexp.MustCompile(`^[a-zA-Z]+$`).MatchString
const alpha = "abcdefghijklmnopqrstuvwxyz"
func IsLetter4(s string) bool {
for _, char := range s {
if !strings.Contains(alpha, strings.ToLower(string(char))) {
return false
}
}
return true
}go bench
go test -bench=.
goos: darwin
goarch: amd64
pkg: github.com/heshed/gotest
cpu: Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
Benchmark/unicode.IsLetter-16 15167793 69.88 ns/op
Benchmark/check_azAZ_char-16 29699143 38.84 ns/op
Benchmark/RegularExpression-16 1505218 772.9 ns/op
Benchmark/check_lowercase-16 1322492 915.3 ns/op
PASS
ok github.com/heshed/gotest 6.444s