JTG E-Business Software Frontend Developer Intern Interview Questions and Answers

Event bubbling is the process where an event triggered on a child element is propagated up to its parent elements.

• Events triggered on child elements will also trigger the same event on parent elements

• Event bubbling allows for delegation of event handling to a parent element

• Can be controlled using event.stopPropagation() method

Use the reverse() method to reverse an array in JavaScript.

• Use the reverse() method on the array to reverse its elements in place.

• Example: const arr = ['apple', 'banana', 'cherry']; arr.reverse(); // ['cherry', 'banana', 'apple']

JS is a scripting language that allows for dynamic content on websites.

• JS is a client-side scripting language used to create interactive web pages.

• It can manipulate HTML and CSS to dynamically update content without reloading the page.

• JS can handle events like button clicks, form submissions, and mouse movements.

• It can also make asynchronous requests to fetch data from servers using AJAX.

• JS code is executed by the browser's JavaScript engine, such as V8 in Chrome or SpiderMon...read more

Use the sort() method in JavaScript to sort an array of strings.

• Use the sort() method with a compare function to sort the array alphabetically.

• For example, array.sort((a, b) => a.localeCompare(b)); will sort the array in ascending order.

• To sort the array in descending order, you can use array.sort((a, b) => b.localeCompare(a));

Event loop in JS manages asynchronous operations by executing callback functions in a queue.

• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows non-blocking I/O operations by executing callback functions in a queue.

• Event loop continuously checks the call stack and the callback queue to prioritize tasks.