go slice不同初始化方式性能及数组比较详解

/*
Package main
@Time   : 2022/11/25 17:47
@Author : ckx0709
@Remark :
*/
package main
// SliceUseSimple 简单的初始化
func SliceUseSimple() []int {
    is := make([]int, 0)
    for i := 0; i < 1000; i++ {
        is = append(is, i)
    }
    return is
}
// SliceUseInitCap 初始化容量
func SliceUseInitCap() []int {
    is := make([]int, 0, 1000)
    for i := 0; i < 1000; i++ {
        is = append(is, i)
    }
    return is
}
// SliceUseInitFull 初始化容量&分配好内存
func SliceUseInitFull() []int {
    is := make([]int, 1000, 1000)
    for i := 0; i < 1000; i++ {
        is[i] = i
    }
    return is
}
// ArrayUse 数组
func ArrayUse() []int {
    var is [1000]int
    for i := 0; i < 1000; i++ {
        is[i] = i
    }
    return is[:]
}

$ go test -benchmem -bench=Benchmark*
goos: windows
goarch: amd64
pkg: go_iteration/other/temp
cpu: Intel(R) Core(TM) i5-9400 CPU @ 2.90GHz
BenchmarkSliceUseSimple-6         348466              3501 ns/op           25208 B/op         12 allocs/op
BenchmarkSliceUseInitCap-6       2190738               548.7 ns/op             0 B/op          0 allocs/op
BenchmarkSliceUseInitFull-6      4408171               261.4 ns/op             0 B/op          0 allocs/op
BenchmarkArrayUse-6              4483910               262.1 ns/op             0 B/op          0 allocs/op
PASS
ok      go_iteration/other/temp 6.067s