main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import "fmt"
// ---------------------------------------------------------
// EXERCISE: Refactor
//
// In the headerOf function, instead of using a switch,
// use a map. Declare it at the package-level.
//
// RESTRICTION
//
// For panicking, use a deferred function and a named param.
//
// EXPECTED OUTPUT
//
// Please run the solution.
//
// ---------------------------------------------------------
func main() {
fmt.Println(headerOf("gif"))
}
func headerOf(format string) string {
switch format {
case "png":
return "\x89PNG\r\n\x1a\n"
case "jpg":
return "\xff\xd8\xff"
}
panic("unknown format: " + format)
}
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