What is a string in Go?

In the Go language, a string (string) is an immutable sequence of bytes, usually representing text in UTF-8 encoding. Strings in Go are a meaningful data type and are stored as a pointer to a byte array and a length.

Features of strings in Go:

• Immutability: once created, a string cannot be changed; any operations that modify the content create a new string.
• Unicode support: strings typically contain UTF-8, allowing work with multilingual text.

Example of using a string in Go:

package main
import "fmt"

func main() {
    s := "Hello, world!"
    fmt.Println(s)
    fmt.Println(len(s)) // length in bytes
}

Here, len(s) returns the number of bytes, not the number of characters, since UTF-8 characters can occupy multiple bytes.