I wish the various papers linked in that page used a different language than Wolfram Alpha to illustrate the various concepts, especially since that language doesn't support even basic functional constructs such as pattern matching.
Among the typical "scientific computing" languages, Wolfram is the only one that has "cool" functional programming tricks as the standard way to solve a problem in it.
1: https://reference.wolfram.com/language/guide/RulesAndPattern...
P.S. Seriously! The amazing functional style of Mathematica is pretty much the one thing I like about it.