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.
The left side of the comparison determines if the variable is NOT an "existing"
trueor an "integer""not a decimal", the result isundefinedIf the left of the comparison fails, then we move to the right comparison
If the integer is odd then return false, else return true.
Because this is kumite. Here it's about showing off skills related to the knowledge of tricks to reduce the length of the code as much as possible, I think. Of course, in "normal" code readability is very important.
Why you dont return simple undefined instead od {}.a ?
I mean:
isEven=n=> n%1==0 ? !(n%2) : undefined
and this is more readability. When you put some whitespace beetween
0
Well done! I didn't know the trick {}.a for undefined...
I think the cache is not utilized at all. Noticed when inserting print statement inside return cached value block.
what does - - do in that code
It ruins the whole purpose