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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.
The code in the rightmost brackets gets executed first, converting the input string to uppercase.
Then, this value is passed into the leftmost pair of brackets (through the use of an es6 arrow function), and compared against the reversed string.
What is '.toUpperCase() doing here? ( I know what it does but why are we using it here?)