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Write string slice line by line to a text file

The bufio package provides an efficient buffered Writer which queues up bytes until a threshold is reached and then finishes the write operation to a file with minimum resources. The following source code snippet shows writing a string slice to a plain text file line-by-line.

Example

package main
 
import (
	"bufio"
	"log"
	"os"
)
 
func main() {
	sampledata := []string{"Lorem ipsum dolor sit amet, consectetur adipiscing elit.",
		"Nunc a mi dapibus, faucibus mauris eu, fermentum ligula.",
		"Donec in mauris ut justo eleifend dapibus.",
		"Donec eu erat sit amet velit auctor tempus id eget mauris.",
	}
 
	file, err := os.OpenFile("test.txt", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
 
	if err != nil {
		log.Fatalf("failed creating file: %s", err)
	}
 
	datawriter := bufio.NewWriter(file)
 
	for _, data := range sampledata {
		_, _ = datawriter.WriteString(data + "\n")
	}
 
	datawriter.Flush()
	file.Close()
}
The sampledata is represented as a string slice which holds few lines of data which will be written to a new line within the file. The function os.OpenFile() is used with a flag combination to create a write-only file if none exists and appends to the file when writing.
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