I wrote this function to check how many days in my object are set to selected, but I don't like the use of the x variable. Are there ways to compact it into the forEach loop to make it more clean?

checkDaySelected() {
  let x = 0;
  this.componentData.days.forEach((d) => {
    if (d.selected) {
      x++
    }
  });
  return x;
}