FAQ: Learn Handlebars - Using Handlebars expressions


This community-built FAQ covers the “Using Handlebars expressions” exercise from the lesson “Learn Handlebars”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Web Development

Building Interactive JavaScript Websites

FAQs on the exercise Using Handlebars expressions

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This question really could apply to most of the Handlebars lesson and the Musicon project. After completing this exercise, I wanted to see if I could play with variations in syntax, but some variants were not successful and I’m not sure why. The first block below is my functional JS code written by following the directions completely:

const source = document.getElementById('greet').innerHTML;
const template = Handlebars.compile(source);
const context = {
  greeting: 'Hello World!'
const compiledHtml = template(context);

const fill = document.getElementById('hello');
fill.innerHTML = compiledHtml;

Since the variable source references the innerHTML of the ‘greet’ element, I wanted to see if I could move .innerHTML to the fill variable declaration:

const fill = document.getElementById('hello').innerHTML;
fill = compiledHtml;

The above code did not work. I can intuit that the variables fill and source are used for different things, but I can’t explain why writing a script like above wouldn’t be functional, nor can I explain why it’s okay to assign the full path to innerHTML of ‘greet’ to source (I did successfully move innerHTML from the source declaration to the compile method argument). I would love to hear an expert explanation. Thanks!


Coming back to this months later, it’s pretty obvious to me now. The parser would interpret my code as reassigning the const variable fill… not allowed. If I ran this with the javascript console up, I’m sure it would throw an error.