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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.
I have tested my code on my system as well as by printing on codewar's console. I am getting the expected value of the given test cases but it raises value not expected error. Is it something related to time constraint?
It's more about quality than quantity. You gain much more from more difficult katas. Besides just solving katas, you gain points for other things as well. You can find most of the information here: http://www.codewars.com/docs/ranking-and-honor-1.
Good luck! :-)
How many questions should I solve each day (complete) to reach 1 kyu?
It simply means that the target string of the merge is "Bananas from Bahamas". I found a bug in my original code that was caught by that particular string, so I let it stay when I transformed it into a kata. :-)
What does the test case Bananas from Bahamas mean?