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Commit ca5d58c

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4.2 非行内拼接字符串推荐使用 strings.Builder
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package datastructure
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import (
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"bytes"
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"strings"
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"testing"
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)
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func BenchmarkJoinStrWithStringsJoin(b *testing.B) {
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s1, s2, s3 := "foo", "bar", "baz"
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for i := 0; i < b.N; i++ {
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_ = strings.Join([]string{s1, s2, s3}, "")
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}
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}
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func BenchmarkJoinStrWithStringsBuilder(b *testing.B) {
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s1, s2, s3 := "foo", "bar", "baz"
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for i := 0; i < b.N; i++ {
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var builder strings.Builder
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_, _ = builder.WriteString(s1)
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_, _ = builder.WriteString(s2)
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_, _ = builder.WriteString(s3)
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}
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}
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func BenchmarkJoinStrWithBytesBuffer(b *testing.B) {
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s1, s2, s3 := "foo", "bar", "baz"
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for i := 0; i < b.N; i++ {
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var buffer bytes.Buffer
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_, _ = buffer.WriteString(s1)
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_, _ = buffer.WriteString(s2)
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_, _ = buffer.WriteString(s3)
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}
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}
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func BenchmarkJoinStrWithByteSlice(b *testing.B) {
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s1, s2, s3 := "foo", "bar", "baz"
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for i := 0; i < b.N; i++ {
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var bys []byte
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bys = append(bys, s1...)
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bys = append(bys, s2...)
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_ = append(bys, s3...)
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}
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}
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func BenchmarkJoinStrWithByteSlicePreAlloc(b *testing.B) {
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s1, s2, s3 := "foo", "bar", "baz"
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for i := 0; i < b.N; i++ {
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bys := make([]byte, 0, 9)
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bys = append(bys, s1...)
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bys = append(bys, s2...)
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_ = append(bys, s3...)
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}
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}
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![carbon](https://raw.githubusercontent.com/boatrainlsz/my-image-hosting/main/202203192129639.svg)

‎performance_rule/readme.md

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| 代码 | 验证结果 |
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| -------------------------------------------------- | -------------------------------------------------- |
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| [join_str_test.go](datastructure/join_str_test.go) | [join_str_test.md](datastructure/join_str_test.md) |
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#### 4.2 非行内拼接字符串推荐使用 strings.Builder
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| 代码 | 验证结果 |
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| ------------------------------------------------------------ | ------------------------------------------------------------ |
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| [str_join_builder_buffer_byte_test.go](datastructure/str_join_builder_buffer_byte_test.go) | [str_join_builder_buffer_byte_test.md](datastructure/str_join_builder_buffer_byte_test.md) |
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####

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