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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.
好比
2+true等于3，2+false等于2，故无碍你是对的
？6+1=？7你这个求？号的值是不是就答案不对了。
c = c >9 是不是应该改成 c = Math.floor(c/10)