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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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And also that Built-in Object methods are made unavailable.
Maybe specify that string versions and comments will not be accepted either, eg '+' not allowed as well as +.
Javascript random cases will sometimes require the preservation of -0 and error for some solutions. Maybe this should not be an issue to come up on an 8 kyu? I recommend using true 0 in those cases, or testing deep equality using ===.
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Could you open up the Beta to JavaScript? Python's on the docket, but I'm not there yet.