How to Convert a Rune to a String in Go?

Converting Rune to String in Golang

To convert a rune to a string, you can use the strconv.QuoteRune() function. However, in your code, you're using scanner.Scan() to read a rune, which is incorrect.

The scanner.Scan() function reads tokens or runes of special tokens controlled by the Scanner.Mode bitmask. It does not return the rune itself but special constants from the text/scanner package.

To read a single rune, use Scanner.Next() instead. Here's the corrected code:

package main

import (
    "fmt"
    "strconv"
    "strings"
    "text/scanner"
)

func main() {
    var b scanner.Scanner
    const a = `a`
    b.Init(strings.NewReader(a))
    c := b.Next()
    fmt.Println(strconv.QuoteRune(c))
}

Output:

'a'

Alternatively, you can directly convert a rune to a string using type conversion, as rune is an alias for int32:

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

Output:

a

For more convenience, you can iterate over the runes of a string using the for ... range construct:

for _, r := range "abc" {
    fmt.Println(string(r))
}

Output:

a
b
c

You can also convert a string to a slice of runes using []rune():

runes := []rune("abc")
fmt.Println(runes) // Output: [97 98 99]

Finally, you can use utf8.DecodeRuneInString() to extract a rune from a string.

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