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.
When no value is passed to
reduce(), like ([]), where the initial value is 0. The reduce returns it's initial value.thank you.
if a is longer than b,
b is a, a is b
it means if no lost number return 0
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This comment is hidden because it contains spoiler information about the solution