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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.
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If you talk about a space between the last word and a question/exclamation mark, then see the example in the kata's description. It's like that. Hence the Simple in the title.
Where? There's nothing like that in the description.
No, but there are a lot of issues with your code. Both lines of
num.toString...andNumber...do absolutely nothing, because you don't assign those values anywhere. Those lines on their own change nothing. As a result, your loop never runs, because "num" is a number, not a string (and doesn't have.lengthproperty).