Append bench

main.go

package main

type Wrapper string

type Chain struct {
	wrps []Wrapper
}

func (c Chain) Append1(wrps ...Wrapper) Chain {
	newWrps := make([]Wrapper, len(c.wrps)+len(wrps))
	copy(newWrps, c.wrps)
	copy(newWrps[len(c.wrps):], wrps)
	return Chain{newWrps}
}

func (c Chain) Append2(wrps ...Wrapper) Chain {
	newWrps := make([]Wrapper, 0, len(c.wrps)+len(wrps))
	newWrps = append(newWrps, c.wrps...)
	newWrps = append(newWrps, wrps...)
	return Chain{newWrps}
}

func (c Chain) Append3(wrps ...Wrapper) Chain {
	newWrps := make([]Wrapper, 0, len(c.wrps)+len(wrps))
	newWrps = append(newWrps, c.wrps...)
	return Chain{append(newWrps, wrps...)}
}

func (c Chain) Append4(wrps ...Wrapper) Chain {
	newWrps := make([]Wrapper, len(c.wrps), len(c.wrps)+len(wrps))
	copy(newWrps, c.wrps)
	return Chain{append(newWrps, wrps...)}
}

main_test.go

package main

import (
	"testing"
)

func benchmarkAppend1(j int, b *testing.B) {
	c := &Chain{
		wrps: []Wrapper{"foo", "bar"},
	}
	for n := 0; n < b.N; n++ {
		for i := 0; i < j; i++ {
			c.Append1("foobar")
		}
	}
}

func benchmarkAppend2(j int, b *testing.B) {
	c := &Chain{
		wrps: []Wrapper{"foo", "bar"},
	}
	for n := 0; n < b.N; n++ {
		for i := 0; i < j; i++ {
			c.Append2("foobar")
		}
	}
}

func benchmarkAppend3(j int, b *testing.B) {
	c := &Chain{
		wrps: []Wrapper{"foo", "bar"},
	}
	for n := 0; n < b.N; n++ {
		for i := 0; i < j; i++ {
			c.Append3("foobar")
		}
	}
}

func benchmarkAppend4(j int, b *testing.B) {
	c := &Chain{
		wrps: []Wrapper{"foo", "bar"},
	}
	for n := 0; n < b.N; n++ {
		for i := 0; i < j; i++ {
			c.Append4("foobar")
		}
	}
}

func BenchmarkAppend1_1(b *testing.B)   { benchmarkAppend1(1, b) }
func BenchmarkAppend1_10(b *testing.B)  { benchmarkAppend1(10, b) }
func BenchmarkAppend1_100(b *testing.B) { benchmarkAppend1(100, b) }

func BenchmarkAppend2_1(b *testing.B)   { benchmarkAppend2(1, b) }
func BenchmarkAppend2_10(b *testing.B)  { benchmarkAppend2(10, b) }
func BenchmarkAppend2_100(b *testing.B) { benchmarkAppend2(100, b) }

func BenchmarkAppend3_1(b *testing.B)   { benchmarkAppend3(1, b) }
func BenchmarkAppend3_10(b *testing.B)  { benchmarkAppend3(10, b) }
func BenchmarkAppend3_100(b *testing.B) { benchmarkAppend3(100, b) }

func BenchmarkAppend4_1(b *testing.B)   { benchmarkAppend4(1, b) }
func BenchmarkAppend4_10(b *testing.B)  { benchmarkAppend4(10, b) }
func BenchmarkAppend4_100(b *testing.B) { benchmarkAppend4(100, b) }