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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.
Should the for loop be inside synchronized block ?
Sorry but I dont understand the "->" notation
This comment is hidden because it contains spoiler information about the solution
I just think that the question doesn't care about strict or non-strict mode.So,let's assume the function is in non-strict mode ,then null and this are equal 'cause they all point to global object (non-strict mode). And the null is just cool !