How do I Convert a Rune to a String in Go?

Rune to String Conversion in Go

When working with Unicode characters in Go, you may encounter situations where you need to convert a rune (an integer representing a Unicode character) to a string. This can be confusing, as Go offers multiple approaches to this task.

Using Scanner.Scan() (Incorrect)

In your provided code, you попытаться to use Scanner.Scan() to convert a rune into a string. However, this approach is incorrect because Scanner.Scan() is intended for lexing purposes and does not directly return the rune character. Instead, it returns a constant indicating the token type (such as scanner.Ident or scanner.Int).

Using Scanner.Next() (Correct)

To properly convert a rune to a string, you should use Scanner.Next() instead. This function reads the next rune from the input and returns it as an integer. You can then use the strconv.QuoteRune() function to convert the rune to a string.

var b scanner.Scanner
const a = `a`
b.Init(strings.NewReader(a))
c := b.Next()
fmt.Println(strconv.QuoteRune(c)) // Output: "'a'"

Direct Rune to String Conversion

If you want to simply convert a single rune to a string, you can use a type conversion. Rune is an alias for int32, and Go supports converting integer values to strings using the built-in string() function.

r := rune('a')
fmt.Println(string(r)) // Output: "a"

Looping Over Runes

To iterate over the runes in a string, you can use the for ... range construct. This technique returns both the index and the rune value for each character in the string.

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

// Output:
// 0 - a (97)
// 1 - b (98)
// 2 - c (99)

Alternative Methods

Other methods for converting runes to strings include:

• utf8.DecodeRuneInString(): Decodes a single UTF-8 encoded rune from the provided string.
• []rune(): Converts a string to a slice of runes.

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