How to Convert Runes to Strings in Go?

Converting Runes to Strings in Go

In Go, it's possible to cast a rune (a Unicode code point) into a string. This can be useful for various operations that require string manipulation.

One way to convert a rune to a string is using the strconv.QuoteRune() function. However, some users may encounter undefined characters when using this method.

To resolve this issue, it's important to understand how the Scanner.Scan() function operates. Scanner.Scan() is designed to tokenize input, which means it recognizes special symbols and tokens controlled by the Scanner.Mode bitmask. When using Scanner.Scan() on a rune, it returns a special constant from the text/scanner package, not the rune itself.

To read a single rune, it's recommended to use Scanner.Next() instead:

c := b.Next()

This will assign the rune 'a' to the variable c, and you can convert it to a string using string casting:

fmt.Println(c, string(c))

If you simply need to convert a single rune to a string, you can use a basic type conversion. Since rune is an alias for int32, integer conversions can be directly applied:

r := rune('a')
fmt.Println(r, string(r))

To iterate over the runes of a string, you can use the for ... range construct:

for i, r := range "abc" {
    fmt.Printf("%d - %c (%v)\n", i, r, r)
}

You can also convert a string to a slice of runes using utf8.DecodeRuneInString():

fmt.Println([]rune("abc"))

Remember, when using the Scanner.Scan() method with Go Tokens mode, it treats runes like Go identifiers, so it's crucial to use Scanner.Next() for accurate rune reading.

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