string concat vs Sprintf bench

main_test.go

package main

import (
	"fmt"
	"testing"
)

var result string

func BenchmarkSprintf(b *testing.B) {
	for i := 0; i < b.N; i++ {
		result = fmt.Sprintf("%s, %s", "hello", "world")
	}
}

func BenchmarkStringConcat(b *testing.B) {
	for i := 0; i < b.N; i++ {
		result = "hello" + ", " + "world"
	}
}

BenchmarkSprintf-4       5000000               325 ns/op
BenchmarkStringConcat-4 2000000000               0.70 ns/op