D3 is a functional paradigm for graphics. From the D3 intro: "...styles, attributes, and other properties can be specified as functions of data in D3, not just

D3 is a functional paradigm for graphics. From the D3 intro: "...styles, attributes, and other properties can be specified as functions of data in D3, not just simple constants." This sounds trite, but it's enormously powerful and it's what makes D3 worth learning.