Yep. But as others have said, it's not really isomorphism in a mathematical sense. The article defines "Isomorphic web applications" as "where the web server an

Yep. But as others have said, it's not really isomorphism in a mathematical sense. The article defines "Isomorphic web applications" as "where the web server and the web browser (the client), may share all, or some parts of the web application code." Just, "same shape" on both sides. If it was identical code, I would (mathematically) call it an identity (which, to be fair, is an isomorphism). But it's not identical; they transpile go to js ("GopherJS - A compiler from Go to JavaScript"). This compilation itself is arguably an isomorphic mapping, with the same code doing equivalent things on both sides. e.g. equivalent assignments between equivalent variables. Two problems with this interpretation (1) a transpiler doesn't have to be isomorphic (e.g. could use different idioms); (2) that's not really the aspect they're referring to.