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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.
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indexOf return the minimum position, so the max and min positions are same only when there is exactly one character of this type
Not kata-related. If you have a question about some language feature you don't understand, search for it on the Internet.
There is a point that I don't understand: The lastIndexOf() method returns the maximum position of the current character in the string, but what about the characters that appears more than once and stands behind?
The lastIndexOf() method returns the maximum position of the current character in the string, but what about the characters that appears more than once and stands behind?