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.

package main   import (
)   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()

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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