100% Free JS-Dev-101 Practice Exam Questions (2026)

A developer at Universal Containers creates a new landing page based on HTML, CSS, andJavaScript TO ensure that visitors have a good experience, a script named personaliseContextneeds to be executed when the webpage is fully loaded (HTML content and all related files ), inorder to do some custom initialization.Which statement should be used to call personalizeWebsiteContent based on the abovebusiness requirement?

A developer creates a simple webpage with an input field. When a user enters text inthe input field and clicks the button, the actual value of the field must be displayed in theconsole.Here is the HTML file content:< input type ='' text'' value=''Hello'' name =''input'' >< button type =''button'' >Display < /button >The developer wrote the javascript code below:Const button = document.querySelector('button');button.addEvenListener('click', () => (Const input = document.querySelector('input');console.log(input.getAttribute('value'));When the user clicks the button, the output is always ''Hello''.What needs to be done make this code work as expected?

Given the code below:const copy = JSON.stringify([ new String(' false '), new Bollean( false ), undefined ]);What is the value of copy?

Given the following code:document.body.addEventListener(' click ', (event) => {if (/* CODE REPLACEMENT HERE */) {console.log('button clicked!');)});Which replacement for the conditional statement on line 02 allows a developer tocorrectly determine that a button on page is clicked?

Refer to the code below:Function changeValue(obj) {Obj.value = obj.value/2;}Const objA = (value: 10);Const objB = objA;changeValue(objB);Const result = objA.value;What is the value of result after the code executes?