But in O notation it will be 3x vs x² i think this is still better than having nested maps or foreach.

For me , this is not best practise , because you will calculate the min and max while the input array is already sorted , view my solution.

number % 2 will be either 0 (if even) or 1 (if odd).

There is another, third option.

I was tempted to use the array_map(), max() and min() functions but with this solution each array is scanned 3 times. Which doesn't pose a problem, we're fine with small arrays.

ok, the random number is now 0 and the guess is 1 but shouldn't they both be the same number to pass the test?

Of course! ... a switch case statement was a better option, veryt clean and a go to way of doing things when the options are predefined.

How???

Omg, why didn't I even think of this??

Great

$this->check(basicOp('/', 4, 0), 0);

Division by zero :(

Indeed:)

I am new on javascript dose this work for other languages.

how does this work??