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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.
the description says 'if the given number can be rearranged' meaning 1212 can be rearranged to 1221 which becomes a palindrom, but i dont know where to start solving this prolem now -and oh you asked this 5 years ago haha
no it's not, if it's then tell me how?
You have to complete challenges you didnt already complete in any other language (can find it by sorting katas by "kata I have not trained on". If you do the same challenge in a different language, it doesnt award you honor. IMO this makes sense since only changing the syntax around doesnt require much problem solving in most cases. This site is far more about the problem solving part of programming than syntax learning.
NaN
is not'NaN'
.typeof(NaN) = "number"
therefore your code is denied from the first if statement and defaults to the else statement. Find a way of correctly dealing with NaN values.read the description again.