001 Shorten URL

001 Shorten URL.js

// Predefined constants
const baseDomain = "https://mywebsite.com/"

// Cached global variables
var urlDictionary = {}

/**
 * Returns a shortened version of the given `url`, which is saved for later
 * retrieval.
 *      url - The url to shorten
 */
function shortenURL(url) {
    
    // Grab a random word, removing it from the list
    // Note that we are splicing the original word list in order to
    // efficiently resize the existing array
    var randInt = getRandomInt(0, words.length - 1);
    var randWord = words.splice(randInt, 1)[0];
    
    // Save the random word --> url mapping
    urlDictionary[randWord] = url;
    
    // Return the shortened version of the URL
    return baseDomain + randWord;
    
}

/**
 * Returns a random integer between min (inclusive) and max (inclusive)
 * Using Math.round() will give you a non-uniform distribution!
 * Obtained from https://stackoverflow.com/questions/1527803
 *          /generating-random-whole-numbers-in-javascript-in-a-specific-range
 */
function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}