Question

How to write a custom URL shortener in JavaScript

Answer 1

// Object to store URL mappings urlDatabase[shortCode] = longURL
const urlDatabase = {};

// Function to generate a random short code
function generateShortCode() {
  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  let shortCode = '';
  
  for (let i = 0; i < 8; i++) {
    shortCode += characters.charAt(Math.floor(Math.random() * characters.length));
  }
  
  return shortCode;
}

// Function to shorten a URL
function shortenURL(longURL) {
  const shortCode = generateShortCode();
  
  urlDatabase[shortCode] = longURL;
  
  return `https://short.url/${shortCode}`;
}

// Function to retrieve the long URL
function getLongURL(shortURL) {
  const shortCode = shortURL.split('/').pop();
  
  return urlDatabase[shortCode] || 'URL not found!';
}

const longURL = 'https://www.seek4info.com/search.php?query=printf';
const shortURL = shortenURL(longURL);
console.log('Shortened URL:', shortURL);

const retrievedLongURL = getLongURL(shortURL);
console.log('Retrieved URL:', retrievedLongURL);



/*
run:

Shortened URL: https://short.url/2V6zLvhz
Retrieved URL: https://www.seek4info.com/search.php?query=printf

*/

 

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