It's worth noting that, although Clojure is undoubtedly dynamically typed, it does more extensive compile-time checking than, e.g., Python or PHP. For example

It's worth noting that, although Clojure is undoubtedly dynamically typed, it does more extensive compile-time checking than, e.g., Python or PHP. For example ;; clojure (let [colour :red] (f color)) will throw a compile-time error, whereas # python colour = "red" f(color) will only show up at runtime. That makes a big practical difference.