Introduction to n-readlines

Welcome to our comprehensive guide on n-readlines. This powerful Node.js module allows you to read a text file line by line with ease. Whether you’re dealing with large files or need granular control over file reading, n-readlines has got you covered. In this guide, we’ll explore its useful APIs and provide examples to help you get started.

Installation

 npm install n-readlines 

Initialization

 const nReadlines = require('n-readlines'); const liner = new nReadlines('path/to/your/file.txt'); 

Basic Line Reading

 let line;
 while (line = liner.next()) {
     console.log(line.toString('utf-8'));
 }

Reading Specific Line

 let line;
 let lineNumber = 10;
 let currentLine = 1;
 while (line = liner.next()) {
     if (currentLine === lineNumber) {
         console.log(line.toString('utf-8'));
         break;
     }
     currentLine++;
 }

Checking for End of File

 let line;
 while (line = liner.next()) {
     console.log(line.toString('utf-8'));
 }
 if (liner.next() === false) {
     console.log('End of file reached');
 }

Handling Errors

 try {
     const liner = new nReadlines('path/to/your/file.txt');
     let line;
     while (line = liner.next()) {
         console.log(line.toString('utf-8'));
     }
 } catch (err) {
     console.error('Error reading file:', err);
 }

Complete Application Example

File Processing App

 const nReadlines = require('n-readlines');
 const fs = require('fs');

 function processFile(inputPath, outputPath) {
     const liner = new nReadlines(inputPath);
     let line;
     let outputData = '';

     while (line = liner.next()) {
         // Process each line if needed, here just converting to uppercase
         outputData += line.toString('utf-8').toUpperCase() + '\n';
     }

     fs.writeFileSync(outputPath, outputData);
     console.log('File processing complete');
 }

 processFile('input.txt', 'output.txt');

We hope this guide helps you leverage the power of n-readlines in your Node.js projects. Happy coding!

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