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"
"os"
"strings"
)
func main() {
args := os.Args
if len(args) != 2 || len(args[1]) != 1 {
fmt.Println("Give me a letter")
return
}
s := args[1]
if strings.IndexAny(s, "aeiou") != -1 {
fmt.Printf("%q is a vowel.\n", s)
} else if s == "w" || s == "y" {
fmt.Printf("%q is sometimes a vowel, sometimes not.\n", s)
} else {
fmt.Printf("%q is a consonant.\n", s)
}
// Notice that:
//
// I didn't use IndexAny for the else if above.
//
// It's because, calling a function is a costly operation.
// And, this way, the code is simpler.
}
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