Simple string formatting function in JS

format.js

// Take a string template with {var1} placeholders and replace them with
// matching keys from POJO
function format(str, data) {
  data = Object(data);

  var re, p;

  for (p in data) {
    if (has(data, p)) {
      re = new RegExp('\\\{' + p + '\\\}', 'g');
      str = str.replace(re, data[p]);
    }
  }

  return str;
}