Allow creation of Polygon from a Nested Array of Points about flatten-js HOT 5 CLOSED

  let array = [[[1,1],[1,3],[2,3],[2,1]], [[2,2], [2,3], [4,3], [4,2]]];
  const polygon = new Polygon();
  for (let points of array) {
    let face = polygon.addFace(points.map(([x, y]) => new Point(x, y)));    
  }

shapeafy(poly, shape=null){
	//only pass in a multi-level array for poly, don't pass in shape. it returns the Flatten.js polygon object
	if(!shape){
		shape = new Polygon()
	}
	if(poly[0][0].length === undefined){
		const face = poly.map(p=> new Point(p))
		shape.addFace(face)
	} else {
		poly.forEach(arr=>this.shapeafy(arr, shape))
	}
	if(shape.isValid()){
		return shape
	} else {
		throw new Error("The shape is not valid: " + JSON.stringify(poly))
	}
}