The Book of JavaScript, 2nd Edition

Summary

If you have mastered this chapter, you now know the following:

• How setTimeout() causes a JavaScript statement to execute in the future

• How to use clearTimeout() to cancel a time-out

• How to create a timed loop by writing a function that sets a time-out that calls the same function

• How to use parseInt() to convert a string to a number, and why you might have to do this

If you read the part about coding timing loops the safe way in "A Safer Version of rotateImage()" on page 162, you also know how to write a timing loop that calls a function taking parameters.

To make sure you understand timing loops and how to cancel them, try the following assignment.