Golang : Read a file into an array or slice example
Ok, got a junior developer that wants to know how to read a text file content line by line into an array or slice. He is dealing with a legacy software that doesn't send out data either in JSON or XML format. The legacy software output is in text format.
Solution :
Use strings.Split()
function with newline (\n
) as the separator and ioutil.ReadFile()
function.
Here you go!
package main
import (
"fmt"
"io/ioutil"
"os"
"strings"
)
func main() {
if len(os.Args) <= 1 {
fmt.Printf("USAGE : %s <target_filename> \n", os.Args[0])
os.Exit(0)
}
fileName := os.Args[1]
fileBytes, err := ioutil.ReadFile(fileName)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
sliceData := strings.Split(string(fileBytes), "\n")
fmt.Println(sliceData)
}
Reference:
See also : Golang : Display a text file line by line with line number example
By Adam Ng(黃武俊)
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+7.7k CodeIgniter : How to check if a session exist in PHP?
+8.2k Golang : How to check for empty array string or string?
+15.5k Golang : Storing cookies in http.CookieJar example
+15.2k Golang : Create PDF file from HTML file
+1.9k Linux/MacOSX : How to symlink a file?
+2.3k Golang : Word limiter example
+2.6k Unix/Linux : How to fix CentOS yum duplicate glibc or device-mapper-libs dependency error?
+6.3k Golang : Generate QR codes for Google Authenticator App and fix "Cannot interpret QR code" error
+16.4k Golang : Saving(serializing) and reading file with GOB
+15.1k Golang : Convert an image file to []byte
818 Golang : How to search a list of records or data structures
+2.5k Golang : Sort lines of text example