This sample script is for splitting command-line arguments by golang. There are 2 types. One is the regular expression is used. Another is that Split() and TrimSpace() are used.
Here, each process speed was compared.
Script :
package main
import (
"regexp"
"strings"
"testing"
)
func BenchmarkB1(b *testing.B) {
str := "test1.txt, test2.txt"
b.ResetTimer()
for i := 0; i < b.N; i++ {
ar := regexp.MustCompile(`\s*,\s*`).Split(str, -1)
var result []string
for _, x := range ar {
result = append(result, x) // --> 'test.js', 'test2.py'
}
_ = result
}
}
func BenchmarkB2(b *testing.B) {
str := "test1.txt, test2.txt"
b.ResetTimer()
for i := 0; i < b.N; i++ {
ar := strings.Split(str, ",")
var result []string
for _, x := range ar {
result = append(result, strings.TrimSpace(x)) // --> 'test.js', 'test2.py'
}
_ = result
}
}
Result :
$ go test -bench .
BenchmarkB1-4 100000 13048 ns/op
BenchmarkB2-4 3000000 399 ns/op
PASS
Just as expected, the regular expression was slow. And it’s much slower than that of Split() and TrimSpace().