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| package hello
import ( "bytes" "fmt" "strings" "testing" )
const ( src = "Hello World!" cnt = 10000 )
var expected = strings.Repeat(src, cnt)
func mycopy(b []byte, s string) []byte { n := len(b) if n+len(s) > cap(b) { t := make([]byte, 2*cap(b)+len(s)) copy(t, b) b = t } b = b[0 : n+len(s)] copy(b[n:], s) return b }
func BenchmarkStringConcat(b *testing.B) { var res string for n := 0; n < b.N; n++ { var str string for i := 0; i < cnt; i++ { str += src } res = str } b.StopTimer() if res != expected { b.Errorf("got=%s, want=%s", string(res), expected) } }
func BenchmarkStringSprintf(b *testing.B) { var res string for n := 0; n < b.N; n++ { var str string for i := 0; i < cnt; i++ { str = fmt.Sprintf("%s%s", str, src) } res = str } b.StopTimer() if res != expected { b.Errorf("got=%s, want=%s", string(res), expected) } }
func BenchmarkStringJoin(b *testing.B) { var res string for n := 0; n < b.N; n++ { var str string for i := 0; i < cnt; i++ { str = strings.Join([]string{str, src}, "") } res = str } b.StopTimer() if res != expected { b.Errorf("got=%s, want=%s", res, expected) } }
func BenchmarkBufferWrite(b *testing.B) { var res string for n := 0; n < b.N; n++ { buf := new(bytes.Buffer) for i := 0; i < cnt; i++ { buf.WriteString(src) } res = buf.String() } b.StopTimer() if res != expected { b.Errorf("got=%s, want=%s", string(res), expected) } }
func BenchmarkBytesAppend(b *testing.B) { var res string for n := 0; n < b.N; n++ { var bytes []byte for i := 0; i < cnt; i++ { bytes = append(bytes, src...) } res = string(bytes) } b.StopTimer() if res != expected { b.Errorf("got=%s, want=%s", string(res), expected) } }
func BenchmarkStringCopy(b *testing.B) { var res string for n := 0; n < b.N; n++ { data := make([]byte, 0, 64) for i := 0; i < cnt; i++ { data = mycopy(data, src) } res = string(data) } b.StopTimer() if res != expected { b.Errorf("got=%s, want=%s", string(res), expected) } }
func BenchmarkStringCopy2(b *testing.B) { var res string for n := 0; n < b.N; n++ { b := make([]byte, 0, 64) for i := 0; i < cnt; i++ { l := len(b) if l+len(src) > cap(b) { t := make([]byte, 2*cap(b)+len(src)) copy(t, b) b = t } b = b[0 : l+len(src)] copy(b[l:], src) } res = string(b) } b.StopTimer() if res != expected { b.Errorf("got=%s, want=%s", string(res), expected) } }
func BenchmarkStringBuilder(b *testing.B) { var res string for n := 0; n < b.N; n++ { var builder strings.Builder for i := 0; i < cnt; i++ { builder.WriteString(src) } res = builder.String() } b.StopTimer() if res != expected { b.Errorf("got=%s, want=%s", string(res), expected) } }
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