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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.
Fixed a few issues where variables are leaked to global scope.
doOp()is even better now.String.prototype.trim()will strip out whitespaces at both the beginning and the tail, which doesn't completely meet the requirements. This version of solution works fine for those tests, though.