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
+13.1k Golang : GUI with Qt and OpenCV to capture image from camera
+5.6k Golang : When to use make or new?
+17.7k Golang : Delete duplicate items from a slice/array
+3.9k MariaDB/MySQL : Form select statement or search query with Chinese characters
+5.5k Nginx : Password protect a directory/folder
+13.6k Golang : Search folders for file recursively with wildcard support
+14.5k Golang : Convert date format and separator yyyy-mm-dd to dd-mm-yyyy
+5k Fix ERROR 2003 (HY000): Can't connect to MySQL server on 'IP address' (111)
+32.6k Golang : Proper way to set function argument default value
+9.8k Golang : Removes punctuation or defined delimiter from the user's input
+6k Golang : Mapping Iban to Dunging alphabets
+5.4k Golang : Convert an executable file into []byte example