Introduction to detect-newline

The detect-newline module is a highly useful JavaScript library for detecting the type of newline character used in a given string or text file. Being able to properly recognize newline characters is essential, especially when working with text processing, file handling, or cross-platform applications where newlines can differ.

Installation

  npm install detect-newline

Usage

Below are several examples of how you can use the detect-newline API to enhance your applications:

Basic Example

  
    const detectNewline = require('detect-newline');

    const input = 'Hello world\\nHello universe';
    const newline = detectNewline(input);
    console.log(newline); // Output: '\n'
  

Detect Newline from Text Files

  
    const fs = require('fs');
    const detectNewline = require('detect-newline');

    fs.readFile('example.txt', 'utf8', (err, data) => {
      if (err) {
        console.error(err);
        return;
      }
      const newline = detectNewline(data);
      console.log(newline);
    });
  

Identifying Mixed Newlines

  
    const detectNewline = require('detect-newline');
    const detectNewlineGrm = require('detect-newline/grm'); // Grammatically correct variant

    const input = 'Hello world\\nHello universe\\r\\nGoodbye world';
    const newline = detectNewline(input);
    const newlineGrm = detectNewlineGrm(input);

    console.log(newline); // Output: '\n' or '\r\n'
    console.log(newlineGrm); // Output: null (confused context for mixed)
  

Asynchronously Detect Newline

  
    const { promises: fs } = require('fs');
    const detectNewline = require('detect-newline');

    async function detectNewlineAsync(filePath) {
      try {
        const data = await fs.readFile(filePath, 'utf8');
        const newline = detectNewline(data);
        console.log(newline);
      } catch (err) {
        console.error(err);
      }
    }

    detectNewlineAsync('example.txt');
  

App Example Using detect-newline

Let’s build a small application that reads a text file, detects the newline character, and logs the occurrence counts of each line.

  
    const fs = require('fs');
    const detectNewline = require('detect-newline');

    fs.readFile('example.txt', 'utf8', (err, data) => {
      if (err) {
        console.error(err);
        return;
      }
      const newline = detectNewline(data);
      const lines = data.split(newline);
      console.log(`Detected newline: ${newline}`);
      console.log(`Number of lines: ${lines.length}`);
      lines.forEach((line, index) => {
        console.log(`${index + 1}: ${line}`);
      });
    });
  

Detect-newline significantly simplifies the task of managing different newline characters within text processing tasks, making your JavaScript applications robust and cross-platform compatible.

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