function bouncer(arr) {
  var newArr = arr.filter(noFalse);
  return newArr;
}

function noFalse(val){
   console.log(typeof val + " type");
   return (val !== false && val !== 0 && val !== undefined && !!val && val !== NaN && val !== "");
}

bouncer([1, null, NaN, 2, undefined]);