var isEven = function(number) {
// Your code goes here!
if (number % 2 === 0 ) {
return true
} else if (isNaN(number)) {
return "This is not a number"
} else {
return false


I'm getting a TypeError: isNaN is not a function



Please use
console.log( isEven('cat') );

++++ reset of session *****************
As you are manipulating with objects
under certain circumstances you can shoot your Browser in an
inconsistent state.

Therefor it is of an advantage to know that you have 2 reset facilities:

One is the use of the F5-key which does a refresh Browser


Two, select&copy your code
Then use the Reset Code button of the course-window,
then paste your code back in.

General Notes:
Always refresh the browser after making corrections:
CTRL f5 ( if on Windows or Linux)
CMD r ( if on a MAC).
CTRL 0 to reset browser zoom