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4.1 行内拼接字符串推荐使用运算符+

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`@@ -0,0 +1,26 @@`
	`1`	`+package datastructure`
	`2`	`+`
	`3`	`+import (`
	`4`	`+ "fmt"`
	`5`	`+ "testing"`
	`6`	`+)`
	`7`	`+`
	`8`	`+/**`
	`9`	`+从性能出发,兼顾易用可读,如果待拼接的变量不涉及类型转换且数量较少(<=5),行内拼接字符串推荐使用运算符 +,反之使用 fmt.Sprintf()。`
	`10`	`+*/`
	`11`	`+`
	`12`	`+// Good`
	`13`	`+func BenchmarkJoinStrWithOperator(b *testing.B) {`
	`14`	`+ s1, s2, s3 := "foo", "bar", "baz"`
	`15`	`+ for i := 0; i < b.N; i++ {`
	`16`	`+ _ = s1 + s2 + s3`
	`17`	`+ }`
	`18`	`+}`
	`19`	`+`
	`20`	`+// Bad`
	`21`	`+func BenchmarkJoinStrWithSprintf(b *testing.B) {`
	`22`	`+ s1, s2, s3 := "foo", "bar", "baz"`
	`23`	`+ for i := 0; i < b.N; i++ {`
	`24`	`+ _ = fmt.Sprintf("%s%s%s", s1, s2, s3)`
	`25`	`+ }`
	`26`	`+}`

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	`1`	`+![carbon (1)](https://raw.githubusercontent.com/boatrainlsz/my-image-hosting/main/202203181455261.svg)`

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`@@ -54,5 +54,10 @@ cpu: AMD Ryzen 5 4600U with Radeon Graphics`
`54`	`54`	`\| ------------------------------------------------------------ \| ------------------------------------------------------------ \|`
`55`	`55`	`\| [slice_capacity_test.go](datastructure/slice_capacity_test.go) \| [slice_capacity_test.md](datastructure/slice_capacity_test.md) \|`
`56`	`56`
	`57`	`+### 4. 字符串拼接方式的选择`
`57`	`58`
	`59`	`+#### 4.1 行内拼接字符串推荐使用运算符+`
`58`	`60`
	`61`	`+\| 代码 \| 验证结果 \|`
	`62`	`+\| -------------------------------------------------- \| -------------------------------------------------- \|`
	`63`	`+\| [join_str_test.go](datastructure/join_str_test.go) \| [join_str_test.md](datastructure/join_str_test.md) \|`

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