Get map region for array of points

helper.js

export const getRegionForCoordinates = (points) => {
  if (!points.length) {
    return {
      // By default show whole Prague
      latitude: 50.0755,
      longitude: 14.4378,
      latitudeDelta: 0.1,
      longitudeDelta: 0.1
    }
  }
  // points should be an array of { latitude: X, longitude: Y }
  let minX
  let maxX
  let minY
  let maxY

  // init first point
  ;((point) => {
    minX = point[0]
    maxX = point[0]
    minY = point[1]
    maxY = point[1]
  })(points[0])

  // calculate rect
  points.forEach((point) => {
    minX = Math.min(minX, point[0])
    maxX = Math.max(maxX, point[0])
    minY = Math.min(minY, point[1])
    maxY = Math.max(maxY, point[1])
  })

  const midX = (minX + maxX) / 2
  const midY = (minY + maxY) / 2
  let deltaX = maxX - minX
  let deltaY = maxY - minY

  // Reserve 10% square free
  deltaY *= 1.1
  deltaX *= 1.1

  return {
    latitude: midX,
    longitude: midY,
    latitudeDelta: deltaX,
    longitudeDelta: deltaY
  }
}