Deletes the node with the provided node_id.

This will also remove any edges attached to the node, and remove it from any clusters it belongs to.

iex> Node.delete(1)

Find the node in the graph that has the provided node_id.

Returns the node, or nil if it is not found.

iex> n = Node.new(label: "Start")
iex> Node.find(n.id) #=> returns `n`

Create a new node with the given attrs and attach it to the active graph.

Returns the map of the node with a unique id.

iex> Node.new(label: "Start")
%{ id: 1, attrs: [label: "Start"] }

Update the attributes of the node with the provided node_id.

If nil is passed as a value in the attrs keyword list, it will remove the key entirely from the node’s attributes.

iex> n = Node.new(label: "Start")
iex> Node.update(n.id, color: "blue", label: nil)