Clojure Values in Clojurescript

Question

I am testing om (https://github.com/omcljs/om) and I don't understand whats happen here:

I have a Clojure code that consume a API and put data into a vector. Then in my ClojureScript code I try:

(def urls (map (fn [c] (get c :url )) billings))
(def n (first urls))

(println n) ;; correct value
(.log js/console n) ;; null

Someone can explain this behavior ?

Thanks

Mike Fikes · Accepted Answer · 2015-03-17 18:28:40Z

1

If you are using a REPL, then println will—assuming you haven't issued (enable-console-print!)—generally print to your REPL. But, console.log goes to your browser's console output.

When you invoke (.log js/console n), the REPL only prints the return value of console.log, so you see nil.

answered Mar 17, 2015 at 18:28

Mike Fikes

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4 Comments

Édipo Féderle Over a year ago

Mike, I see null on browser (console). So how I can see this value on browser ?

Mike Fikes Over a year ago

It is making me wonder if n is handled differently when converted to a string for printing (in that you have some odd sort of object). If you do (println (str n)) compared to (.log js/console (str n)) do you get different results?

Édipo Féderle Over a year ago

(println (str n)) print correct value and (.log js/console (str n)) print null (on browser)

Mike Fikes Over a year ago

Wow. How about the behavior of (let [s (str n)] (println s) (.log js/console s))?

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