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3.2 指定切片容量

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`@@ -0,0 +1,27 @@`
	`1`	`+package datastructure`
	`2`	`+`
	`3`	`+import (`
	`4`	`+ "testing"`
	`5`	`+)`
	`6`	`+`
	`7`	`+const size = 1000000`
	`8`	`+`
	`9`	`+func BenchmarkSliceWithoutCapacity(b *testing.B) {`
	`10`	`+ // Bad`
	`11`	`+ for n := 0; n < b.N; n++ {`
	`12`	`+ data := make([]int, 0)`
	`13`	`+ for k := 0; k < size; k++ {`
	`14`	`+ data = append(data, k)`
	`15`	`+ }`
	`16`	`+ }`
	`17`	`+}`
	`18`	`+`
	`19`	`+func BenchmarkSliceWithCapacity(b *testing.B) {`
	`20`	`+ // Good`
	`21`	`+ for n := 0; n < b.N; n++ {`
	`22`	`+ data := make([]int, 0, size)`
	`23`	`+ for k := 0; k < size; k++ {`
	`24`	`+ data = append(data, k)`
	`25`	`+ }`
	`26`	`+ }`
	`27`	`+}`

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	`1`	`+![carbon](https://raw.githubusercontent.com/boatrainlsz/my-image-hosting/main/202203181109956.svg)`

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`@@ -48,3 +48,11 @@ cpu: AMD Ryzen 5 4600U with Radeon Graphics`
`48`	`48`	`\| ------------------------------------------------------------ \| ------------------------------------------------------------ \|`
`49`	`49`	`\| [map_capacity_hint_test.go](datastructure/map_capacity_hint_test.go) \| [map_capacity_hint_test.md](datastructure/map_capacity_hint_test.md) \|`
`50`	`50`
	`51`	`+#### 3.2 指定切片容量`
	`52`	`+`
	`53`	`+\| 代码 \| 验证结果 \|`
	`54`	`+\| ------------------------------------------------------------ \| ------------------------------------------------------------ \|`
	`55`	`+\| [slice_capacity_test.go](datastructure/slice_capacity_test.go) \| [slice_capacity_test.md](datastructure/slice_capacity_test.md) \|`
	`56`	`+`
	`57`	`+`
	`58`	`+`

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