function immutablyReplacePosition()

in modules/edit-modes/src/lib/immutable-feature-collection.ts [224:266]

• 38 lines of code
• 7 McCabe index (conditional complexity)

function immutablyReplacePosition(
  coordinates: any,
  positionIndexes: number[] | null | undefined,
  updatedPosition: Position,
  isPolygonal: boolean
): any {
  if (!positionIndexes) {
    return coordinates;
  }
  if (positionIndexes.length === 0) {
    return getUpdatedPosition(updatedPosition, coordinates);
  }
  if (positionIndexes.length === 1) {
    const updated = [
      ...coordinates.slice(0, positionIndexes[0]),
      getUpdatedPosition(updatedPosition, coordinates[positionIndexes[0]]),
      ...coordinates.slice(positionIndexes[0] + 1),
    ];

    if (
      isPolygonal &&
      (positionIndexes[0] === 0 || positionIndexes[0] === coordinates.length - 1)
    ) {
      // for polygons, the first point is repeated at the end of the array
      // so, update it on both ends of the array
      updated[0] = getUpdatedPosition(updatedPosition, coordinates[0]);
      updated[coordinates.length - 1] = getUpdatedPosition(updatedPosition, coordinates[0]);
    }
    return updated;
  }

  // recursively update inner array
  return [
    ...coordinates.slice(0, positionIndexes[0]),
    immutablyReplacePosition(
      coordinates[positionIndexes[0]],
      positionIndexes.slice(1, positionIndexes.length),
      updatedPosition,
      isPolygonal
    ),
    ...coordinates.slice(positionIndexes[0] + 1),
  ];
}