a = 1and
b = 2. The variable names
bbecome names of their corresponding nodes, and the numbers
2are their definitions. They have no input ports and one output port each.
c = a + b. It has the
bnodes connected to its inputs. Thanks to this, you can clearly see where does the input data come from.
c.succ. The node has no name, as the corresponding line does not define any variables. It has the node
cconnected to its
selfport. This port denotes the target of method call.