ES6 class constructor shortcut for setting instance properties

Question

I seem to remember seeing a shortcut where you didn't have to do this.foo assignments in the constructor if the property and the constructor argument was named the same thing - but I can't seem to find the reference for it googling around.

For example:

class Polygon {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
}

Could you instead do something like

class Polygon {
  constructor(height=height, width=width) { 
     // wasn't there a way to declare these arguments so it auto sets the instance variables?
  }
}

Answer 1

You could change it to:

class Polygon {
  constructor(height, width) {
    Object.assign(this, { height, width })
  }
}

This would mean you pass a singular object instead of multiple arguments