sprint-like function for javascript

sprintf.js

/**
 * Thanks Raymond Powell
 * http://stackoverflow.com/a/14640439/1071793
 */
String.prototype.format = function () {
  var formatted = this,
      prop,
      regexp = new RegExp('\\{' + prop + '\\}', 'gi');
  for (prop in arguments[0]) {
    formatted = formatted.replace(regexp, arguments[0][prop]);
  }
  return formatted;
};