Pick a single value out of a multiple return in golang.

main.go

package main

import (
	"fmt"
	"io/ioutil"
)

func door(number int) func(...interface{}) interface{} {
	return func(doors ...interface{}) interface{} {
		return doors[number]
	}
}

func main() {
	fmt.Printf("%s", door(0)(ioutil.ReadFile("test.txt")))
}

test.txt

It's a new car!

With inspiration from "http://blog.vladimirvivien.com/2014/03/hacking-go-filter-values-from-multi.html".