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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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I think the description is confusing because in the example he uses; 67890 is highest in 1234567890, numbers are consecutive as in 1,2,3 not just next to each other.
indexOf will always return the index of the first occurrence of an array item. In ['a', 'b', 'a'], the indexOf('a') is 0. When using filter and the loop reaches the second 'a', it will drop it since that particular 'a' has an index of 2.
Can someone explain how this works? Im confused with the filter function, how does index varable work?