Web Programming Web Programming 3

Question 1

What is the difference between '==' and '===' in JavaScript?

Accepted Answer

== allows type coercion, === checks both value and type strictly

Answer

== performs type coercion before comparing, while === checks both value and type without conversion.

Question 2

In HTML, what attribute makes a form field required before submission?

Accepted Answer

required

Answer

The 'required' attribute on an input element triggers browser validation to prevent form submission if the field is empty.

Question 3

What is the purpose of a CSS media query?

Accepted Answer

Applies styles based on device characteristics like screen width

Answer

Media queries apply CSS rules conditionally based on device features such as viewport width, enabling responsive design.

Question 4

Which HTTP method is typically used to UPDATE an existing resource in a REST API?

Accepted Answer

PUT

Answer

PUT replaces an existing resource with the provided data; PATCH is used for partial updates.

Question 5

What does the 'async' keyword do when added to a JavaScript function?

Accepted Answer

Makes the function always return a Promise

Answer

An async function always returns a Promise and enables the use of 'await' inside it to pause execution until a Promise resolves.

Web Programming Practice Test