先说优点

• strings.Builder:省内存
• bytes.Buffer:快

性能测试程序

package benchmark_test
import (
	"bytes"
	"strings"
	"testing"
)
var (
	ss = "1234567890abcdefghijklmnopqrstuvwxyz"
	bs = []byte(ss)
	rn = 'a'
	bt = byte('a')
)
func BenchmarkBuilderWrite(b *testing.B) {
	var builder strings.Builder
	for i := 0; i < b.N; i++ {
		builder.Write(bs)
	}
}
func BenchmarkBuiderWriteByte(b *testing.B) {
	var builder strings.Builder
	for i := 0; i < b.N; i++ {
		builder.WriteByte(bt)
	}
}
func BenchmarkBuilderWriteRune(b *testing.B) {
	var builder strings.Builder
	for i := 0; i < b.N; i++ {
		builder.WriteRune(rn)
	}
}
func BenchmarkBuilderWriteString(b *testing.B) {
	var builder strings.Builder
	for i := 0; i < b.N; i++ {
		builder.WriteString(ss)
	}
}
func BenchmarkBufferWrite(b *testing.B) {
	var buffer bytes.Buffer
	for i := 0; i < b.N; i++ {
		buffer.Write(bs)
	}
}
func BenchmarkBufferWriteByte(b *testing.B) {
	var buffer bytes.Buffer
	for i := 0; i < b.N; i++ {
		buffer.WriteByte(bt)
	}
}
func BenchmarkBufferWriteRune(b *testing.B) {
	var buffer bytes.Buffer
	for i := 0; i < b.N; i++ {
		buffer.WriteRune(rn)
	}
}
func BenchmarkBufferWriteString(b *testing.B) {
	var buffer bytes.Buffer
	for i := 0; i < b.N; i++ {
		buffer.WriteString(ss)
	}
}

本文来自:开源中国博客

感谢作者:UMU

查看原文:[UMU 学 golang](8) strings.Builder vs bytes.Buffer

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