How to convert a rune to unicode-style-string like `\u554a` in Golang?

Question

If you run fmt.Println(\"\\u554a\"), it shows \'啊\'.

But how to get unicode-style-string \\u554a from a rune \'啊\' ?

Answer 1

IMHO, it should be better:

func RuneToAscii(r rune) string {
    if r < 128 {
        return string(r)
    } else {
        return "\\u" + strconv.FormatInt(int64(r), 16)
    }
}

Answer 2

fmt.Printf("\\u%X", '啊')

http://play.golang.org/p/Jh9ns8Qh15

(Upper or lowercase 'x' will control the case of the hex characters)

As hinted at by package fmt's documentation:

%U Unicode format: U+1234; same as "U+%04X"