On: State of Clojure 2015: Survey Results

[147]

There's cljc which is a conditional reader that lets you code in clj and cljs in the same file.

It's not that difficult to write a library that runs on both.

But there are differences in the runtimes, of course.

Some examples:

https://github.com/stuartsierra/component https://github.com/plumatic/schema (uses .cljx, the precursor to .cljc)

[jfaucett → 147]

Nice examples. Am I correct in guessing that this code:

    (ns com.stuartsierra.component
      (:require [com.stuartsierra.dependency :as dep]
            [com.stuartsierra.component.platform :as platform]))

requires the correct platform.clj or platform.cljs depending on the runtime?

And that this:

    #?(:clj
       (defmethod clojure.core/print-method SystemMap
         [system ^java.io.Writer writer]
         (.write writer "#<SystemMap>"))
       :cljs
       (extend-protocol IPrintWithWriter
         SystemMap
         (-pr-writer [this writer opts]
           (-write writer "#<SystemMap>"))))

is how you perform different operations in a single file based on runtime?

[147 → jfaucett]

The first part requires platform on both platforms. You are correct about the latter.