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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.
The correct output for if you test this code with {a: 1, b: '2'} should be 'a = 1, b = 2', while your function produces "undefineda = 1, b = 2, ".
The you should initialize your string variable to get rid of undefined and try to figure out how to get rid of that dangling comma at the end.