Python-like .format method for javascript String

string-format.js

// Original: http://stackoverflow.com/questions/610406/javascript-equivalent-to-printf-string-format
// Edited: cybercase

if (!String.prototype.format) {
  String.prototype.format = function(dict) {
    return this.replace(/{(\w+)}/g, function(match, key) {
      return typeof dict[key] !== 'undefined'
        ? dict[key]
        : match
      ;
    });
  };
}

// example:
console.log('{salutation} {place}'.format({
  salutation: 'hello',
  place: 'world'})
);