javascript-timers

Question 1

What is a “callback” function?

Answer 1

A function passed into another function as an argument, which is then invoked inside the outer function to complete some kind of routine or action

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

setTimeout() function

Question 3

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

Answer 3

setInterval() function

Question 4

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

Answer 4

0

Question 5

What do setTimeout() and setInterval() return?

Answer 5

setTimeout(): returned timeoutID is a positive integer value which identifies the timer created by the call to setTimeout().
setInterval(): returned intervalID is a numeric, non-zero value which identifies the timer created by the call to setInterval()