Function reduce

Reduces over points, treating x and y separately.

// Sum x and y values
const total = Points.reduce(points, (p, acc) => {
 return {x: p.x + acc.x, y: p.y + acc.y}
});

reduce(pts, fn, initial?): Point
Parameters
- pts: readonly Point[]
  Points to reduce
- fn: ((p: Point, accumulated: Point) => Point)
  Reducer
  - - (p, accumulated): Point
    - Parameters
      p: Point
      accumulated: Point
      Returns Point
- Optionalinitial: Point
  Initial value, uses { x:0, y:0 } by default
Returns Point