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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.
Singleton is a javascript object. so, with
Singleton.__instance = this;
we are creating a property __instance on the Singleton object and setting its value to this.
The if condition checks if the Singleton object has __instance property on it and returns that if its present, so, basically using the same "this" object everytime.