Medium post

rectangle.js

export class Rectangle {
    constructor (width, height) {
        this.width  = width
        this.height = height
    }
    set width  (width)  { this._width = width             }
    get width  ()       { return this._width              }
    set height (height) { this._height = height           }
    get height ()       { return this._height             }
    get area   ()       { return this.width * this.height }
}