find the length of a string in go

In Go, the length of a string can be calculated using the built-in len() function.

Here's an example:

main.go
package main

import "fmt"

func main() {
    str := "Hello, World!"
    length := len(str)
    fmt.Printf("Length of the string is %d", length) // Output: Length of the string is 13
}
185 chars
10 lines

Note that in Go, strings are encoded in UTF-8 encoding, so the len() function returns the number of bytes in the string, not the number of characters. To get the number of characters, you can use the utf8.RuneCountInString() function:

main.go
package main

import (
    "fmt"
    "unicode/utf8"
)

func main() {
    str := "Hello, 世界!"
    length := utf8.RuneCountInString(str)
    fmt.Printf("Length of the string is %d", length) // Output: Length of the string is 9
}
227 chars
13 lines

This will correctly give the length of the string as 9, which is the number of Unicode code points in the string (including the Chinese characters).