If you're having trouble, look at the
Boolean and
timing events exercises.
For calculating the reaction time, do NOT set an interval. Instead, record when the
page changes color, and record when the user clicks the button. Then do some math to
calculate the reaction time. Use the
Date.now method to get the
current time. Complete this
illustration
to understand how Date.now works.
Formula for calculating reaction time: (reaction time) = (end time) - (start time)