learn_golang/learn_go_with_tests/my_select/racer.go

package my_select

import (
	"net/http"
	"time"
)

func Racer(a string, b string) (winner string) {
	aDuration := measureResponseTime(a)
	bDuration := measureResponseTime(b)

	if aDuration < bDuration {
		return a
	}

	return b
}

func measureResponseTime(url string) time.Duration {
	start := time.Now()
	http.Get(url)
	return time.Since(start)
}