Hash finder for hash challange http://www.h11e.com/

find-hash.js

var crypto = require('crypto'),
    cuid   = require('cuid'),
    string,
    zeros = 0,
    currentHash = '',
    currentZeros = 0,
    hash;

function findZeros(hash) {
    var chars = hash.split(''),
        zeros = 0,
        i;

     for (i = 0; i < chars.length; i++) {
         if (chars[i] === '0') {
             zeros++;
         } else {
             break;
         }

     }
     return zeros;
}

/**
 * Why you use interval here why not while (true) ? 
 * Because the computer I use is not meant for this mainly
 *
 * You know that in node you got one thread ?
 * Yes you can use cluster module for creating something fancier for this
 *  
 * @return {Number} interval id
 */
var id = setInterval(function () {
    string = cuid();
    hash   = crypto.createHash('sha512').update(string).digest('hex');

    currentZeros = findZeros(hash);
    if (currentZeros > zeros) {
        currentHash = hash;
        zeros = currentZeros;

        console.log("Better hash found " + hash + " - " + string);
    }
}, 20);