Time Golang functions in a single line of code with logger.

golang-timing-functions-francesc-2

// Author: @francesc
package main

import (
	"log"
	"time"
)

type Logger struct {
	Log func(format string, args ...interface{})
}

func whenDone() Logger {
	start := time.Now()
	return Logger{func(format string, args ...interface{}) {
		log.Printf(format, append(args, time.Since(start))...)
	}}
}

func process(name string) {
	defer whenDone().Log("total time processing %v: %v", name)

	log.Printf("started processing %v", name)
	time.Sleep(time.Second)
}

func main() {
	process("foo")
}