to converted to number

removed negative numbers from conditions and tests

The better fix would be using BigInts. ( The even better fix of also using negative odd numbers would require rationals, which unfortunately JS does not have natively. )

Sure, the definition of double factorial can be extended to give results for negative odd numbers.

Ask for all of those, or none of those, not just -1 -> 1.

ETA: asking for all of 'em may be different enough to normal factorials that it would not be retired.

yeh, now fixed

Initial code has not been fixed.

fixed

double_factorial is a Python method name, doubleFactorial is more suited for JS

Keep in mind this kata would likely be retired due to low user satisfaction. A kata should add something new. Double factorial is just a very minor variation on factorial.

fixed

Your numbers are too big to be precise.

I'm sure this should be obvious but what does the + operator do in this return statement?

bro, how did you pass the tests????

If my mistakes have been corrected, when can I publish my kata?