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const addAdjacencies = (
  nodes,
) => (
  nodes
  .map(({
    colorId,
    id,
    x,
    y,
  }) => ({
    adjacentIds: (
      nodes
      .filter(({
        x: adjacentX,
        y: adjacentY,
      }) => (
        adjacentX === x + 1
        && adjacentY === y
        || (
          adjacentX === x - 1
          && adjacentY === y
        )
        || (
          adjacentX === x
          && adjacentY === y + 1
        )
        || (
          adjacentX === x
          && adjacentY === y - 1
        )
      ))
      .filter(({
        colorId: adjacentColorId,
      }) => (
        adjacentColorId
        === colorId
      ))
      .map(({
        id,
      }) => (
        id
      ))
    ),
    color: colors[colorId],
    id,
  }))
  .filter(({
    adjacentIds,
  }) => (
    adjacentIds
    .length > 0
  ))
)