Getters / Setters

Accessor properties are represented by getter and setter methods. In an object literal they are denoted by get and set.

Example of getter and setter.

    function Circle(radius) {
        
        this.radius = radius;

        let defaultLocation =  { x: 0, y: 0 };

        this.getDefaultLocation = function() {
           return defaultLocation;
        } 

        this.draw = function() {
           console.log('draw');
        }

        Object.defineProperty(this, 'defaultLocation', {
            // Getter
            get: function() {
               return defaultLocation; 
            },
            // Setter
            set: function(value) {
                if (!value.x || !value.y)
                    throw new Error ('Invalid location.');

                defaultLocation = value;
            }
        });
    }

    circle.draw();
    circle.defaultLocation.x = 5;
    console.log(circle.defaultLocation);