Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Build a Simple Dynamic Site with Node.js Creating a Basic Template Engine in Node.js A Simple Merge Utility

Ajithlal Parackel
Ajithlal Parackel
990 Points

why it is off

Why it is not getting result

var utilities = require("./utilities");

var mailValues = {};

mailValues.first_name = "Janet";

var emailTemplate = "Hi %first_name%! Thanks for completing this code challenge :)";

var mergedContent = utilities.merge(emailTemplate, mailValues);

//mergedContent === "Hi Janet! Thanks for completing this code challenge :)";
function merge(content, values) {
  for (var key in values) {
    content.replace("%"+key+"%", values[key]);
  return content;

module.exports.merge = merge;

1 Answer

Umesh Ravji
Umesh Ravji
42,386 Points

Hi Ajithlal, the replace() method doesn't change the string it's called on, but returns a new string value that must be re-assigned to the value of content in order to save the changes made.

content = content.replace("%"+key+"%", values[key]);