Loading collection data...
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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How can this be done without
indexOf?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.
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Not really sure what's going on here. Explanation?
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spoiler flags!
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution