CIW JavaScript Specialist 4

Question 1

Which built-in JavaScript object provides methods for working with dates and times?

Accepted Answer

Date

Answer

The Date object provides methods to create, retrieve, and manipulate dates and times in JavaScript.

Question 2

What does the async keyword do when placed before a function declaration?

Accepted Answer

Causes the function to always return a Promise

Answer

An async function always returns a Promise, and allows the use of the await keyword inside it to pause execution until a promise settles.

Question 3

In JavaScript, which method is used to convert a string to an integer?

Accepted Answer

parseInt()

Answer

parseInt() parses a string argument and returns an integer of the specified radix, stopping at the first non-numeric character.

Question 4

What is event bubbling in the browser DOM?

Accepted Answer

After an event fires on a target element, it propagates upward through ancestor elements

Answer

Event bubbling means an event triggered on a child element propagates up through its parent elements in the DOM tree unless stopped.

Question 5

Which JavaScript method removes the last element from an array and returns it?

Accepted Answer

pop()

Answer

Array.pop() removes the last element from an array, mutates the original array, and returns the removed element.

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