How to determine the number of characters in a string value?

In Go, to determine the number of characters in a string, you need to consider that a string is a sequence of bytes, and characters (runes) can occupy multiple bytes (UTF-8).

To get the number of characters (runes), use the utf8.RuneCountInString function from the unicode/utf8 package:

package main

import (
    "fmt"
    "unicode/utf8"
)

func main() {
    s := "Привет"
    count := utf8.RuneCountInString(s)
    fmt.Println(count)  // Will output 6
}

If you use just len(s), it will return the number of bytes, not characters.