Question Bank

What does Array.prototype.indexOf() return if the element is not found?

What is the purpose of Object.keys()?

What does Object.values() return?

What does Object.entries() return?

What is lazy loading?

What is the Observer pattern?

What is the Singleton pattern?

What is Content Security Policy (CSP)?

What does parseInt() do?

What does parseFloat() do?

What is the Module pattern in JavaScript?

What does the 'arguments' object contain?

What does Array.isArray() check?

What does Math.floor() do?

What does Math.ceil() do?

What does Math.round() do?

Which method is used to add an element to the end of an array?

What does Object.assign() do?

What is a Web Worker?

What is a Service Worker?