In this example, we will show you how to write to file in Go with an example.

The File.WriteString function writes the contents of a string to a file.

Go - write to file with File.WriteString

The example writes a string to a text file.

Let's first create an empty 'sample.txt' file that we want to write upon.

Let's create a file named go_example.go and add the following content to it:

package main

import (
    "fmt"
    "log"
    "os"
)

func main() {

    f, err := os.Create("sample.txt")

    if err != nil {
        log.Fatal(err)
    }

    defer f.Close()

    _, err2 := f.WriteString("My first fav programming languge is Go Lang \nMy second fav programming languge is Java \nMy third fav programming languge is Python\n")

    if err2 != nil {
        log.Fatal(err2)
    }

    fmt.Println("done")
} 

Output:

 G:\GoLang\examples>go run go_example.go
done

After executing above program, open the 'sample.txt' file and you should able to see the content of the file as below:

My first fav programming languge is Go Lang 
My second fav programming languge is Java 
My third fav programming languge is Python