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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.
Not a kata suggestion
Same here using keys() :)
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Look at the top of the page: 8600 people passed the JS kata...
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My language is C++.
Spent around 1h to conplete this kata, my advise is to read the fucking description properly and to make vectors of pairs. Also the att test contain some BIG numbers -> so the sub-function of getting the sum of digits will be easier done if you use the string representation of your number. Nice Kata btw ).