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const addAdjacencies = (
  nodes,
) => (
  nodes
  .map(({
    colorId,
    id,
    x,
    y,
  }) => ({
    color: colors[colorId],
    eastId: (
      getNodeAtLocation({
        nodes,
        x: x + 1,
        y,
      })
    ),
    id,
    northId: (
      getNodeAtLocation({
        nodes,
        x,
        y: y - 1,
      })
    ),
    southId: (
      getNodeAtLocation({
        nodes,
        x,
        y: y + 1,
      })
    ),
    westId: (
      getNodeAtLocation({
        nodes,
        x: x - 1,
        y,
      })
    ),
  }))
  .map(({
    color,
    id,
    eastId,
    northId,
    southId,
    westId,
  }) => ({
    adjacentIds: (
      [
        eastId,
        northId,
        southId,
        westId,
      ]
      .filter((
        adjacentId,
      ) => (
        adjacentId !== undefined
      ))
    ),
    color,
    id,
  }))
)