Solution Review: Count Even Integers in a List

let list = [10, 3, 17, 23, 40, 22, 99];
let rec countEven = (myList) => {
  switch(myList) {
    | [] => 0 /* Base case -> Return 0 */
    | [head, ...tail] => {
      if(head mod 2 == 0){
        1 + countEven(tail); /* recursive call with increment if head is even */
      } else {
        countEven(tail); /* Recursive call without increment */
      }
    }
  };
};
Js.log(countEven(list));