package main

import (
	"bytes"
	"strings"
	"testing"
)

func nHellos(n int) []string {
	ss := make([]string, n)
	for i := range ss {
		ss[i] = "hello"
	}
	return ss
}

func BenchmarkConcat(b *testing.B) {
	for i := 0; i < b.N; i++ {
		c := ""
		for _, s := range nHellos(i) {
			c = c + s
		}
	}
}

func BenchmarkWriteString(b *testing.B) {
	for i := 0; i < b.N; i++ {
		var buffer bytes.Buffer
		for _, s := range nHellos(i) {
			buffer.WriteString(s)
		}
		buffer.String()
	}
}

func BenchmarkJoin(b *testing.B) {
	for i := 0; i < b.N; i++ {
		strings.Join(nHellos(i), "")
	}
}

func BenchmarkCopy(b *testing.B) {
	for i := 0; i < b.N; i++ {
		c := make([]byte, 0)
		for _, s := range nHellos(i) {
			copy(c, s)
		}
	}
}