Getter & Setters

function createCircle(r) {
  let radius = r;
  this.draw = function() {
    console.log("draw the cirlce");
  };
  this.getRadius = function() {
    return radius;
  };

  this.setRadius = function(val) {
    if (val <= 0) {
      throw Error("Number is not valid");
    }
    radius = val;
    return radius;
  };
}

const circle = new createCircle(10);
console.log(circle.getRadius());
const newRadius = circle.setRadius(-10);
console.log(newRadius);