templating-fun.js

let template = '<h1>My name is {{name}}. This is a {{adjective1}} {{adjective2}} template!</h1>';

let model = {
  name: 'Jeremy',
  adjective1: 'super',
  adjective2: 'awesome'
};

function _template(tmpl, data) {
  for (var property in data) {
      if (data.hasOwnProperty(property)) {
        tmpl = tmpl.replace(`{{${property}}}`, data[property]);
      }
  }
  return tmpl;
}

console.log(_template(template, model));