Only for the main diagonal. So the top left corner to the bottom right corner.

💀

Thank you kind sir for this explaination!

Like what XoRMiAS said, you're trying to match the typeof for the first argument and check if the first variable's typeof is equal to the second argument. So like in the description typeof 42 would equal "number". Then "number" === "number", which returns true. Where as typeof "42" would return "string", and string !== number, so it returns false.

It took me half an hour to realize I'm suppose to match the type of variable equal to type.
Before I was matching the type of both equal to each other. (T.T)

This one is a great kata, really makes you think of all the possible alternatives. I was stuck for almost two hours until I finally debugged what was wrong. Forgot to do a math method. 10/10 kata!