After releasing the first major version of clecs I have started writing a tetris clone on it. I wanted to see if it all made sense. Sadly it wasn’t as much fun as I had intended it to be. This is a post about the pain points I discovered and how I intend to fix them.
Homoiconicity means you can express programs in a programming language’s primitive data types. In other words; your code is data and data is code.
Clojure is, as other dialects of Lisp, a homoiconic programming language. Code is represented as lists, symbols, vectors and other Clojure data types. When the reader (parser) reads a source file, abstract syntax tree built looks exactly like the source.
“If we stopped wasting people’s time, what would they do with it?”
This is the second part of my The Lean Startup notes. Enjoy!
A useful debugging tool when you can’t figure out what’s going on: wrap a form with ?, and the form will be printed alongside its result. The result will still be passed along.
Before taking a look at the source code let’s go through some usage examples since this one’s a bit more tricky than defproject:
user=> (str (list 1 2 (+ 1 2))) "(1 2 3)" user=> (str (? (list 1 2 (? (+ 1 2))))) (+ 1 2) is 3 (list 1 2 (? (+ 1 2))) is (1 2 3) "(1 2 3)"
I have pre-ordered the The Lean Startup but then I haven’t opened its cover except to skim through a few random sentences now and then. I have finished it during my summer vacation. These are my short notes from the book. They are quite terse and mostly for my own reference. But take a look anyway, you might find these concepts interesting. In any case, I strongly recommend the book.