FYI, if you *want* warnings about redefinition of functions, or any vars in
general, the Clojure lint tool Eastwood does that, among other things:
https://github.com/jonase/eastwood
Andy
On Wed, Aug 27, 2014 at 7:32 AM, Tassilo Horn <t...@gnu.org> wrote:
> Hemant Gautam <gettingerr...@gmail.com> writes:
>
> Hi Hemant,
>
> > This is the code
> >
> > (ns clojure_begins_19_08_2014.core)
>
> Use hyphens instead of underscores for namespace and var names.
>
> > (defn first-fn[x]
> > (print x))
> >
> > (defn first-fn[x]
> > (print "Value of x with String " x))
> >
> > (first-fn 10)
> >
> > See, above code consists of two function with same name and with same
> > number of arguments. When I call first-fn, the function declared
> > later gets called. I get output as:
> >
> > Value of x with String 10
> > nil
> >
> > So can any one explain how this thing is happening
>
> The second definition overrides the first one. That's possible in
> Clojure because when developing you usually have a REPL connection and
> add and change functions in the live system as you go.
>
> > and also explain how we can have same function written 2 times in a
> > same namespace.
>
> You can't. Or more precise, you can't after the file has been loaded.
> Note that when your file above is loaded, in between of the two defns
> you could call (first-fn 10) which would only print "10" because in this
> short region, the first version is active.
>
> Possibly one could enhance the Clojure compiler or reader so that it
> emits a warning in case a function is defined twice in the same file and
> namespace. But since you can also have multiple files defining stuff in
> the same namespace, I guess intended overriding during a REPL session
> and unintended overriding like above may become hard to distinguish.
>
> Bye,
> Tassilo
>
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