Go slice performance benchmark

slice_benchmark.go

package main

import "testing"

func BenchmarkInitLen(b *testing.B) {
	n := b.N
	for i := 0; i < n; i++ {
		a := make([]int64, n)
		for j := 0; j < n; j++ {
			a[j] = int64(j)
		}
	}
}

func BenchmarkInitCap(b *testing.B) {
	n := b.N
	for i := 0; i < n; i++ {
		a := make([]int64, 0, n)
		for j := 0; j < n; j++ {
			a = append(a, int64(j))
		}
	}
}

func BenchmarkZero(b *testing.B) {
	n := b.N
	for i := 0; i < n; i++ {
		var a []int64
		for j := 0; j < n; j++ {
			a = append(a, int64(j))
		}
	}
}

func BenchmarkInitZeroLen(b *testing.B) {
	n := b.N
	for i := 0; i < n; i++ {
		a := make([]int64, 0)
		for j := 0; j < n; j++ {
			a = append(a, int64(j))
		}
	}
}