Trello Developer Challenge https://trello.com/jobs/developer

trello.js

/**
 * @author Sascha Droste
 * @description trello developer challenge
 *
 */

var trello = 956446786872726;


/**
 * calculate trello hash
 * @param  {string} s input string
 * @return {int64} calculated hash value
 */
var hash = function hash(s) {
    var h = 7;
    var i;
    var letters = "acdegilmnoprstuw";
    var l = s.length;

    for (i = 0; i < l; i++) {
        h = (h * 37 + letters.indexOf(s[i]));
    }
    return h;
};

/**
 * reverse hash value to string
 * @param  {int} v hash value
 * @return {string} string which match the hash
 */
var rhash = function rhash(v) {

    var letters = "acdegilmnoprstuw";
    var l = letters.length;

    var r = (v - (v % 37)) / 37;

    if (v > l) {
        return rhash(r) + letters[v % 37];
    } else {
        return '';
    }
};

console.log(rhash(trello));