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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.
It would be better to test if weight is defined in the setter of the property, not in the constructor :
var myCat = new Cat("garfield",150);
myCat.weight = null; //should throw an error
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