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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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Can you elaborate on this issue?
How many days are there in the year 100 / -100 / 400 / -400 respectively?
Exception: Century years are NOT leap years UNLESS they can be evenly divided by 400.
Well, try asking yourself:
What is the value of "f" in each loop?
.You can use console.log for the answer. From here, you should know why.
Because it's not an empty array or null. The tests are fine.
From description:
If the input is an empty array or is null, return an empty array.