How to get *ns* string in ClojureScript

cljs-ns.adoc

How to get *ns* string in ClojureScript

It’s not so easy to get *ns* string in ClojureScript as you might expect but here is a tip.

It is impossible to get *ns* string at run-time in ClojureScript (except in self-hosted ClojureScript) but it can be accessed at compile-time only. So you have to use a macro to get it as the following example.

I came up with this idea in the course of implementing set-ns-blacklist! and set-ns-whitelist! (https://github.com/philoskim/debux#debux-config) in my debux library.

example/macro.clj

(ns example.macro)

(defmacro current-ns []
  (str *ns*))

example/lab.cljs

(ns example.lab
  (:require-macros [example.macro :refer [current-ns]]))

(current-ns)
; => "example.lab"

@Menthalion

The followings have the same result.

(str *ns*)

(str (.getName *ns*))

(str (ns-name *ns*))

Both (.getName *ns*) and (ns-name *ns*) return the clojure.lang.Symbol type.

Do you have any opinion or reason about which one is better?

See here (http://cljs.github.io/api/cljs.core/STARnsSTAR) for one example.

Anyway thanks for suggestion!

Cool macro.

I also realized you can use ::. So something like:

(->> (clojure.string/split ::test #"/") first (drop 1) (clojure.string/join))

Also works, and does not require the use of a macro.