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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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If you look at some of the solutions it is definitely not tested.
Basically, if the operation exists in the ops object I call its function with the num1 and num2 arguments.
If the operation does not exist in ops I default (using ||) to a function which returns null. num1 and num2 are also provided to the default function but are ignored.