On Sun, Sep 18, 2011 at 4:40 AM, Meikel Brandmeyer <m...@kotka.de> wrote:
> Hi,
>
> Am 18.09.2011 um 10:11 schrieb Ken Wesson:
>
>> Tell me which is simpler:
>>
>> Reader.read("{:foo 1 :bar " + x + "}");
>
> String x = "13rabc";
>
> Have fun.
Syntactically invalid Clojure code would fail just as much in Clojure
source as it would in Java source.
If x is expected to be a string, it needs to be quoted. If it's not,
then you have a type error that will blow up at runtime, same as
usual.
>> Var keyword = RT.var("clojure.core", "keyword");
>> Var hashMap = RT.var("clojure.core", "hash-map");
>> hashMap.invoke(keyword.invoke("foo"), 1, keyword.invoke("bar"), x);
>
> This one is more simple. This is clojure code.
No, it's Java code, and butt-ugly Java code at that.
> And the example shows what unnecessary boilerplate is required in Java which
> Clojure hides from you. Everyone knowing how to call
> a clojure function understands this code after learning how to get a Var from
> a namespace and how to to invoke it.
Capability of understanding isn't the issue. Speed of understanding
is. It takes a lot longer to parse that. And it's harder to be sure it
doesn't have errors.
> For yours you have to know what x is. You have to quote it if you want to
> pass it as a string. You have to escape various quotes in strings. You have
> to know features of the reader.
Your point being? You have to know this stuff to write functioning
Clojure source code, too -- including what types you expect in what
parts of your business logic.
>> Nobody suggested using the reader in the cases where it is actually
>> more compact to express using stuff like the above, by the way.
>
> Compactness says close to nothing about simplicity.
In this case, it does.
--
Protege: What is this seething mass of parentheses?!
Master: Your father's Lisp REPL. This is the language of a true
hacker. Not as clumsy or random as C++; a language for a more
civilized age.
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