It can usually be implemented like this. No need for strings.
fun isNan(n) = n != n
Also no need to define that in JS, because Number.isNaN() has been around forever (note the case). The global isNaN() has been there from the very beginning, but use Number.isNaN() because it doesn't coerce the param to a number.
Ah, clever!
Also no need to define that in JS, because Number.isNaN() has been around forever (note the case). The global isNaN() has been there from the very beginning, but use Number.isNaN() because it doesn't coerce the param to a number.
Ah, clever!