That code is ugly anyway, something I would have wrote in middle school... why not: function check(x) { return test1(x) && test2(x) && test3(x) &&

That code is ugly anyway, something I would have wrote in middle school... why not: function check(x) { return test1(x) && test2(x) && test3(x) && test4(x); } Or, since I assume is JavaScript, just: const check = x => test1(x) && test2(x) && test3(x) && test4(x);