> First of all, thanks a lot for ClojureScript. A lot of interesting new stuff
> to learn and it has been very educational to read the ClojureScript source
> code.
>
> The following had me scratching my head for far too long. I translated some
> quite simple code from the closure book (the one with the bird on the cover)
> and I couldn’t get it to work. The problematic part of the program was the
> following js function:
>
> example.main = function() {
> var root = goog.dom.getElement('root');
> root.addEventListener('click', example.click, false /* capture */);
> root.addEventListener('mouseover', example.mouseover, false /* capture
> */);
> root.addEventListener('mouseout', example.clearHighlight, false /* capture
> */);
> };
>
> which I translated to:
>
> (defn ^:export main []
> (let [root (dom/getElement "root")]
> (doto root
> (.addEventListener 'click' click false)
> (.addEventListener 'mouseover' mouseover false)
> (.addEventListener 'mouseout' clear-highlight false))))
>
> No compile-time errors, warnings or runtime errors. And no events fired. Can
> you spot the mistake? It’s kind of a special case but I wonder if it would
> be possible for the compiler to generate a warning. It’s a mistake that I
> think experienced javascript developers might have a hard time to spot.
>
> Thanks,
> Jonas
>
>
> (The problem, of course, is that ‘click’ is a string in javascript but
> evaluates to the symbol click’ in clojurescript so it’s easy to make
> copy-paste errors)
Thanks, that's something ClojureScript programmers should watch out
for. In Clojure though, one always uses double-quotes for strings
because the single quote is a reader macro in Clojure (and other
Lisps).
TL; DR - Always use double quotes to denote strings in ClojureScript;
single quotes have special meaning in Clojure (and hence
ClojureScript).
Regards,
BG
--
Baishampayan Ghose
b.ghose at gmail.com
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