《Go 1.10中值得关注的几个变化》的评论 https://tonybai.com/2018/02/17/some-changes-in-go-1-10/ 一个程序员的心路历程 Wed, 25 Mar 2026 09:21:20 +0000 hourly 1 http://wordpress.org/?v=3.2.1 作者：bigwhite https://tonybai.com/2018/02/17/some-changes-in-go-1-10/#comment-7136 bigwhite Tue, 20 Feb 2018 16:16:31 +0000 http://tonybai.com/?p=2558#comment-7136 嗯，差距其实就在String方法上。 嗯，差距其实就在String方法上。

]]> 作者：iikira https://tonybai.com/2018/02/17/some-changes-in-go-1-10/#comment-7135 iikira Tue, 20 Feb 2018 03:39:23 +0000 http://tonybai.com/?p=2558#comment-7135 不过 bytes.Buffer 的String方法确实很耗时, 可达到数秒....... 不过 bytes.Buffer 的String方法确实很耗时, 可达到数秒…….

]]> 作者：iikira https://tonybai.com/2018/02/17/some-changes-in-go-1-10/#comment-7134 iikira Tue, 20 Feb 2018 03:29:46 +0000 http://tonybai.com/?p=2558#comment-7134 你好, strings.Builder 和 bytes.Buffer 的 String 方法, 差距确实很大，但拼接的过程中， WriteString等方法，测试bytes.Buffer效率更高，说 strings.Builder全面强于bytes.Buffer不恰当吧 代码： package main import ( "bytes" "strings" "testing" ) var ( by = "123456789123456789123456789123456789" ) func BenchmarkBuffer(b *testing.B) { buf := &bytes.Buffer{} for i := 0; i < b.N; i++ { buf.WriteString(by) buf.WriteString("123") // buf.String() } } func BenchmarkBuilder(b *testing.B) { buf := &strings.Builder{} for i := 0; i < b.N; i++ { buf.WriteString(by) buf.WriteString("123") // buf.String() } } 输出: $ go test -benchmem -bench=.* goos: darwin goarch: amd64 BenchmarkBuffer-4 20000000 70.0 ns/op 83 B/op 0 allocs/op BenchmarkBuilder-4 30000000 155 ns/op 205 B/op 0 allocs/op PASS ok _/Users/apple/go/playground/benchmark 6.463s 你好, strings.Builder 和 bytes.Buffer 的 String 方法, 差距确实很大，但拼接的过程中，
WriteString等方法，测试bytes.Buffer效率更高，说 strings.Builder全面强于bytes.Buffer不恰当吧

代码：
package main

import (
“bytes”
“strings”
“testing”
)

var (
by = “123456789123456789123456789123456789″
)

func BenchmarkBuffer(b *testing.B) {
buf := &bytes.Buffer{}
for i := 0; i < b.N; i++ {
buf.WriteString(by)
buf.WriteString("123")
// buf.String()
}
}

func BenchmarkBuilder(b *testing.B) {
buf := &strings.Builder{}
for i := 0; i < b.N; i++ {
buf.WriteString(by)
buf.WriteString("123")
// buf.String()
}
}

输出:
$ go test -benchmem -bench=.*
goos: darwin
goarch: amd64
BenchmarkBuffer-4 20000000 70.0 ns/op 83 B/op 0 allocs/op
BenchmarkBuilder-4 30000000 155 ns/op 205 B/op 0 allocs/op
PASS
ok _/Users/apple/go/playground/benchmark 6.463s

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