string utils

string-utils.js

 /**
  * return a random, unique-ish id
  */
 function guid() {
      return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
          var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
          return v.toString(16);
      });
 }

 /**
  * pads a number and returns the string
  * @param {int} n - the integer to pad
  * @param {int} a - total amount of characters in returned string
  * @param {string} p - the character to use for padding
  */
 function pad(n, a, p) {
     if (String(n).length >= a) {
       return String(n);
     }
     var s = "";
     for (var i = 0; i < a; i++) {
       s += p;
     }
     return (s + String(n)).slice(-a);
   }