Comparing between string and byte buffer in golang

string_buffer_perf.go

package main

import (
	"bytes"
	"fmt"
	"strings"
	"time"
)

func main() {
	// String concatenation
	start := time.Now()
	s := ""
	for i := 0; i < 100000; i++ {
		s += "x"
	}
	elapsed := time.Since(start)
	fmt.Printf("String concatenation: %s\n", elapsed) // String concatenation: 448.49125ms

	// bytes.Buffer
	start = time.Now()
	var buffer bytes.Buffer
	for i := 0; i < 100000; i++ {
		buffer.WriteString("x")
	}
	s = buffer.String()
	elapsed = time.Since(start)
	fmt.Printf("bytes.Buffer: %s\n", elapsed) // bytes.Buffer: 1.66225ms

	// string.Builder
	start = time.Now()
	var builder strings.Builder
	for i := 0; i < 100000; i++ {
		builder.WriteString("x")
	}
	s = builder.String()
	elapsed = time.Since(start)
	fmt.Printf("strings.Builder: %s\n", elapsed) // string.Builder: 1.097833ms
}