Benchmarking

main_test.go

package main

import (
	"fmt"
	"strings"
	"testing"
)

// generateArgs generates args (100)
func generateArgs() []string {
	var args []string
	for i := 0; i < 100; i++ {
		val := fmt.Sprintf("value-%d", i)
		args = append(args, val)
	}
	return args
}

// BenchmarkEchoEfficient provides a benchmark for the echo command logic written in an efficient manner
func BenchmarkEchoEfficient(b *testing.B) {
	args := generateArgs()
	for i := 0; i < b.N; i++ {
		_ = strings.Join(args[1:], " ")
	}
}

// BenchmarkEchoInefficient provides a benchmark for the echo command logic written in an inefficient manner
func BenchmarkEchoInefficient(b *testing.B) {
	args := generateArgs()
	for i := 0; i < b.N; i++ {
		var s, sep string
		for _, arg := range args {
			s += sep + arg
			sep = " "
		}
	}
}

// Run the benchmark: go test -bench=.