I've made the same kinds of mistakes, many times. :-) > I guess the REPL message was saying that it can't cast a Java string > as a Clojure function.
Yes, exactly. > I wonder how ClojureScript would be like if it didn't have the Lisp > style syntax. I think it's been the biggest part of the learning > curve. I'm sure you'll get used to it and forget it was ever an issue--it just takes a little time. DD On 2015/02/17 12:59, Marc Fawzi wrote: > Oh! > > I guess the REPL message was saying that it can't cast a Java string as > a Clojure function. > > The parenthesis. I was trying to invoke a string. How dumb of me. > > Lesson learned. Also, learned to try it in the browser for a more > familiar type error message. > > I wonder how ClojureScript would be like if it didn't have the Lisp > style syntax. I think it's been the biggest part of the learning curve. > > Thank you :) > > > On Mon, Feb 16, 2015 at 7:44 PM, Dave Della Costa <[email protected] > <mailto:[email protected]>> wrote: > > Hi Marc, > > This isn't an interop issue but simply is arising from the fact that you > are attempting to call a string as though it were a function, and it is > getting caught at runtime. > > To compare, I tried the same code in ClojureScript and I saw: "Uncaught > TypeError: undefined is not a function" which is roughly the same > (although I'm a bit surprised by the "undefined" and would have expected > that to be a string). > > In any case, I'm not sure what your original goal was, but maybe this > was what you were looking for? > > > (map #(name (key %)) f) > > That is, you don't need to wrap this in a call to 'str,' name already > returns a string. > > DD > > On 2015/02/17 11:15, Marc Fawzi wrote: > > As a new user to ClojureScript who has not programmed in Clojure > or any > > JVM-to-JS environment this comes to me as a huge surprise! > > > > (it shouldn't if I had thought things more deeply, but don't have the > > luxury of infinite ramp up time) > > > > user=> (def f {"a" "1" "b" "2"}) > > > > user=> (map #((name (key %))) f) > > > > ClassCastException java.lang.String cannot be cast to clojure.lang.IFn > > user/eval1212/fn--1213 > (b43f5f5d46b2bd87480559901c3a9d087879416a-init.clj:1) > > > >>>> Is that a Java/Clojure Interop error? I suppose if the REPL throws > > then I'll also see this error or a variant of it IN THE BROWSER ? > > > > The error is resolved if I do this > > > > (map #(str (name (key %))) f) > > > > I thought Clojure is dynamically typed and I understand for Java > interop > > on the server if we have to do this but why couldn't we get away > with it > > in the browser environment? > > > > My limited understanding is that str here is like String(val) in JS, > > which is almost never needed. > > > > > > Please enlighten, whomever understands the interop stuff and why as > > front end developers we have to carry that burden? > > > > > > > > > > -- > > Note that posts from new members are moderated - please be patient with > > your first post. > > --- > > You received this message because you are subscribed to the Google > > Groups "ClojureScript" group. > > To unsubscribe from this group and stop receiving emails from it, send > > an email to [email protected] > <mailto:clojurescript%[email protected]> > > <mailto:[email protected] > <mailto:clojurescript%[email protected]>>. > > To post to this group, send email to [email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>>. > > Visit this group at http://groups.google.com/group/clojurescript. > > -- > Note that posts from new members are moderated - please be patient > with your first post. > --- > You received this message because you are subscribed to the Google > Groups "ClojureScript" group. > To unsubscribe from this group and stop receiving emails from it, > send an email to [email protected] > <mailto:clojurescript%[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at http://groups.google.com/group/clojurescript. > > > -- > Note that posts from new members are moderated - please be patient with > your first post. > --- > You received this message because you are subscribed to the Google > Groups "ClojureScript" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at http://groups.google.com/group/clojurescript. -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/clojurescript.
