Leap year checker

Objective

Write a function that calculates if a given year is a leap year

Logic

A year is a leap year IF:

1. It can be divided exactly by 4

2. Except: if it can also be divided exactly by 100

3. Except: it it can aslo be divided exactly by 400

Requirements

1. The function should be called isLeapYear

2. It should take a single parameter, year which should be a number

3. It should return true if the year is a leap year, else it should return false

4. You should NOT use any JavaScript date functions or libraries

Check your solution