This post is a response to/inspired by The Hunt for the Missing Data Type (HN) by Hillel Wayne. I suggest reading his article first. Why do programming languages lack built-in support for graphs and graph algorithms? Or—why is there no “datatype” for a graph? Hillel Wayne argues (in the post linked above) that there are a few reasons: There are too many types of graphs. There are too many graph algorithms. Even if you focus on one particular type of graph, there are many possible different graph...