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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.
Basically lambda is just a plpaceholder for a variable which can also take more values/parameters. With those you can give them also functionalities. It is very similar to a basic function. But for flexing-reasons you will see many people using it here since you can finish most codes in just one line. But also you may need lambdas within functions for some tasks.