Thank you, saved my day!

work smart, not hard

The description is unclear. It's a lot easier to solve it with this instructions:

A year is a leap year if the following conditions are satisfied:

1. The year is a multiple of 400.
2. The year is a multiple of 4 and not a multiple of 100.

There is an error in your solution:

• You seem to mix up reverse and reversed,
• You don't use reverse correctly (it modifies an array in-place, and not returns a new reversed array),
• The reason why you even use reverse is not really clear.

Another problem is that you call parseInt with an argument which is not a string.