How to Get the length of a string in Go

In this tutorial we are going to learn, how to find out the length of a string in Go language.

Getting the string length

To get the length of a string, we can use the built in len() function in Go.

The len() function takes the string as an argument and returns the number of bytes in a string, if a string is empty ("") it returns 0.

Here is an example, that gets the length of a string stored in the str variable:

package main
import "fmt"

func main() {
    str := "hello"
    length := len(str)
    fmt.Println(length)
}

Output:

5

or we can use the RuneCountInString() function which is present inside the utf8 package.

package main

import (
    "fmt"
    "unicode/utf8"
)

func main() {
    str := "hi";
    length := utf8.RuneCountInString(str)
    fmt.Println(length)
}

Output:

2