JavaScript DOM Scripting By Example Editing and Filtering Names Fix DOM Manipulation Code

I am stumped. Please help.

I understand that the challenge is asking me to embolden only index's 0, 1, and 2. I don't know how to correct this code to do that. I just need an explaination on how to do so. Thank you in advance.

const laws = document.getElementsByTagName('li');
const indexText = document.getElementById('boldIndex');
const button = document.getElementById('embolden');

button.addEventListener('click', (e) => {
    const index = parseInt(indexText.value, 10);

    for (let i = 0; i < laws.length; i += 1) {
       let law = laws[i];

       // replace 'false' with a correct test condition on the line below
       if (false) {

  = 'bold';
       } else {
  = 'normal';
<!DOCTYPE html>
  <title>Newton's Laws</title>
  <h1>Newton's Laws of Motion</h1>
    <li>An object in motion tends to stay in motion, unless acted on by an outside force.</li>
    <li>Acceleration is dependent on the forces acting upon an object and the mass of the object.</li>
    <li>For every action, there is an equal and opposite reaction.</li>
  <input type="text" id="boldIndex">
  <button id="embolden">Embolden</button>
  <script src="app.js"></script>

2 Answers

Steven Parker
Steven Parker
195,719 Points

Here's a few hints:

  • it's easier than you might think
  • you only need to replace "false" with a comparison expression
  • you're looking for a match between the loop variable and the index selected by the input
  • the existing code has conveniently put the value of the input into the variable "index" already

I'll bet you can get it now!

Ya I just got it! if ( i === index) Thank you Steven!