main_test.go

package main

import (
	"fmt"
	"strconv"
	"testing"
)

var columns = []string{"a", "b", "c", "d", "e", "f"}

func Benchmark_AddStr(b *testing.B) {
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		nc := make([]string, len(columns))
		for j, c := range columns {
			nc[j] = "c." + c
		}
	}
}

func Benchmark_SprintfStr(b *testing.B) {
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		nc := make([]string, len(columns))
		for j, c := range columns {
			nc[j] = fmt.Sprintf("c.%s", c)
		}
	}
}

func Benchmark_AddInt(b *testing.B) {
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		nc := make([]string, len(columns))
		for j := range columns {
			nc[j] = "c." + strconv.Itoa(j)
		}
	}
}

func Benchmark_SprintfInt(b *testing.B) {
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		nc := make([]string, len(columns))
		for j := range columns {
			nc[j] = fmt.Sprintf("c.%d", j)
		}
	}
}

# go test -bench . -benchmem
goos: linux
goarch: amd64
pkg: github.com/***
Benchmark_AddStr-2               2648538               635 ns/op             115 B/op          7 allocs/op
Benchmark_SprintfStr-2           1000000              1584 ns/op             211 B/op         13 allocs/op
Benchmark_AddInt-2               2533928               491 ns/op             115 B/op          7 allocs/op
Benchmark_SprintfInt-2            636294              1864 ns/op             176 B/op         12 allocs/op
PASS
ok      github.com/***    7.855s