https://play.golang.org/p/05wZM9BhfB
I'm working on some code that reads UTF32 and converts it to go strings.
I'm finding some surprising behavior when casting slices of runes to
strings.
runes := []rune{'©'}
fmt.Printf(" cast to string: (%s)\n", string(runes))
fmt.Printf("bytes in string: (%x)\n", string(runes))
Output:
cast to string: (©)
bytes in string: (c2a9) // <-- where's the C2 byte coming from??
The weird part is that casting the rune slice to a string causes it to pick
up an additional leading character.
runesi 0x00-0x7f get nothing prepended.
runes 0x80-0xbf gets a leading c2 byte as seen above.
runes 0xc0-0xff gets a leading c3 byte.
rune 0x100 gets a leading c4 byte. Seems like a pattern here.
The same thing happens if I add the runes into a bytes.Buffer with
WriteRune(), then print it out with bytes.Buffer.String().
Can anyone explain this?
What's the correct way to convert a slice of runes into a string?
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