dom-events

Question 1

Why do we log things to the console?

Answer 1

checking functionality and check data; test code and debug

Question 2

What is the purpose of events and event handling?

Answer 2

to trigger a function; make the page feel more interactive

Question 3

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

Answer 3

it means that it is optional

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 method

Question 5

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

Answer 5

event object

Question 6

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

Answer 6

a reference to the value of the object onto which the event was dispatched. check with MDN

Question 7

What is the difference between these two snippets of code?

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

Answer 7

the latter code will call the function immediately

Question 8

what is a callback function?

Answer 8

a function being called into another function as an argument