JS does not have an Integer type, so (x > 0) does not work It depends on what the surrounding code actually does wheter (x > 0) works or not. Depending on the

JS does not have an Integer type, so (x > 0) does not work It depends on what the surrounding code actually does wheter (x > 0) works or not. Depending on the version of is-positive-integer you are using a positive instance of the class Number may return true, false or cause an error. PS. never mind that the implementation of is-positive-integer is extremely inefficient.