javascript-timers

Question 1

What is a “callback” function?

Answer 1

A function that is passed as an argument of another function and is called by the outer function.

Question 2

Besides adding an event listener callback function to an element or the document, what is one way to delay the execution of a JavaScript function until some point in the future?

Answer 2

Using setTimeout( ) function.

Question 3

How can you set up a function to be called repeatedly without using a loop?

Answer 3

Using setInterval( ) function.

Question 4

What is the default time delay if you omit the delay parameter from setTimeout( ) or setInterval( )?

Answer 4

The value used is 0.

Question 5

What do setTimeout( ) and setInterval( ) return?

Answer 5

They return a timeoutID or intervalID, which are positive integer values.