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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 don't understand well the usage of {} in this context (I have only see them as the equivalent of do..end in blocks).
How does Ruby know that it has to repeat "n" v times?
In this case there is no difference between
raise TypeError.new "#{n} is invalid"and
raise TypeError, "#{n} is invalid"The second form is preferable however.
Very good...but what is the interest of TypeError.new compared to TypeError?
...except that Array.new() throws an error if given a negative integer and we need to rescue that as well.