dom-events

Question 1

Why do we log things to the console?

Answer 1

Remove bugs and check functionality.

Question 2

What is the purpose of events and event handling?

Answer 2

User interaction.

Question 3

What do [ ] square brackets mean in function and method syntax documentation?

Answer 3

Optional values.

Question 4

What method of element objects lets you set up a function to be called when a specific type of event occurs?

Answer 4

AddEventListener( ).

Question 5

What is a callback function?

Answer 5

A function that takes another function as parameter and is not called by us.

Question 6

What object is passed into an event listener callback when the event fires?

Answer 6

Event object.

Question 7

What is the event.target? If you weren’t sure, how would you check? Where could you get more information about it?

Answer 7

It is the elements that was interacted with. MDN.

Question 8

What is the difference between these two snippets of code?

element. addEventListener(‘click’, handleClick);
element. addEventListener(‘click’, handleClick( ));

Answer 8

The first is a callback function.

The second it an anonymous function.