Learning Functional Programming in Go

More application code

The first thing we do in the main() function is check the RUN_HTTP_SERVER environment variable. If it's set to true, then the program will set up two routes. The first route /cars returns the index page that displays all the cars that have been loaded from the .csv files. The second route /cars/:id retrieves an individual car object and returns its JSON representation:

func main() {       if os.Getenv("RUN_HTTP_SERVER") == "TRUE" {              router := httprouter.New()              router.GET("/cars", CarsIndexHandler)              router.GET("/cars/:id", CarHandler)              log.Println("Listening on port 8000")              log.Fatal(http.ListenAndServe(":8000", router))

The IndexedCars variable is defined in types.go as follows:

IndexedCar struct {       Index int `json:"index"`       Car ...