How Can Go's `Readln` Function Simplify Idiomatic Line Reading?

Idiomatic Line Reading in Go with Readln

When working with input/output operations in Go, it's often necessary to read a line of text as a string. However, the standard library readline functions primarily return byte arrays.

A Convenient Solution: The Readln Function

The Readln function provides a convenient way to convert a byte array from readline to a string. Here's how it works:

<br>import (</p>
<pre class="brush:php;toolbar:false">"bufio"
"fmt"
"os"

)

// Readln returns a single line (without the ending n)
// from the input buffered reader.
// An error is returned iff there is an error with the
// buffered reader.
func Readln(r *bufio.Reader) (string, error) {
var (

isPrefix bool = true
err error = nil
line, ln []byte

)

for isPrefix && err == nil {

line, isPrefix, err = r.ReadLine()
ln = append(ln, line...)

}

return string(ln), err
}

func main() {
f, err := os.Open("filename.txt")
if err != nil {

fmt.Println("error opening file= ", err)
os.Exit(1)

}

r := bufio.NewReader(f)

for line, err := Readln(r); err == nil; line, err = Readln(r) {

fmt.Println(line)

}

if err != io.EOF {

fmt.Println("error reading file= ", err)
os.Exit(1)

}
}

Example Usage

The main() function opens a file, creates a buffered reader from it, and then uses the Readln function to iterate over each line in the file. The Readln function returns both the line as a string and an error value. The program continues reading lines until the end of the file is reached or an error occurs.

This approach simplifies line reading in Go, providing a more idiomatic and user-friendly method to obtain strings from input.

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