Is There a More Efficient Way to Read a Specific Line from a File?

How to Efficiently Read a Specific File Line

The need to read particular lines from a file arises frequently in programming. To address this, a function, ReadLine, was developed. While it effectively achieves the desired outcome, there's a lingering question: is there a superior, more efficient approach?

The ReadLine function utilizes a bufio.Scanner to traverse the file line by line. Upon reaching the specified line number, it retrieves and returns the line text, current line number, and potential scanning errors.

<code class="go">func ReadLine(r io.Reader, lineNum int) (line string, lastLine int, err error) {
    sc := bufio.NewScanner(r)
    for sc.Scan() {
        lastLine++
        if lastLine == lineNum {
            return sc.Text(), lastLine, sc.Err()
        }
    }
    return line, lastLine, io.EOF
}</code>

However, it's worth noting that this function assumes the file can fit into memory. For incredibly large files, an alternative strategy that processes the file line by line, without storing the entire file in memory, might be more suitable.

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