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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.
In this case, since it is just using the Array.prototype.join() method to join each array element with a space, it doesn't really benefit from "use strict".
Thank you for the info. I'm still struggling to see what restrict mode exactly accomplishes in this particular problem. Are there any problems with the join method?
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why is using substring considered better that charAt?
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what does use strict mean?