jeremycochoy

  init(from list: [T] = []) {
    cursor = list.first
    rightList = list
  }
  
  /// Convert to a swift array
  func toList() -> [T] {
    if let c = cursor {
      return leftList + [c] + rightList.reversed()
    } else {

jeremycochoy

struct ListZipper<T> {
  
  private var leftList: [T] = []
  private var rightList: [T] = []
  
  /// Cursor to the selected Track
  var cursor: T? = nil

}

jeremycochoy

def encode(points, precision = 1e5)
 result = ""
 last_lat = last_lng = last_timestamp = 0
 # Convert each point (lat, lng, ts) to a string
 points.each do |point|
  # Convert to integer
  lat = (point[0] * precision).round
  lng = (point[1] * precision).round
  timestamp = point[2]
  # Compute the difference with the previous point

jeremycochoy

coordinates = []
word = ""
polyline.each_byte do |b|
  # Add the character b to the current chunk
  word << b
  next unless b < 0x5f # While we are below the _ ascii code
  # Add the chunk to the list of coordinates represented by a string
  coordinates << word
  word = ""
end