Arc Forum | In Erlang, using a hypothetical Arc-like web framework:said(_Req) -> form(...

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4 points by yariv 6498 days ago | link | parent

In Erlang, using a hypothetical Arc-like web framework:

said(_Req) -> form(fun(Data) -> link(["you said: ", arg(Data, "foo")], "click here") end, input("foo"), submit()).

The main different is that Erlang doesn't have syntactic sugar for a single-variable lambda function. However, the total number of tokens is almost the same.

Maybe I'll take some ideas from Arc and use them in ErlyWeb :) Thanks for the illuminating example -- I've never seen this kind of programming style before.

1 point by partdavid 6497 days ago | link

Thanks, I was scanning this for Erlang and took a look at ErlyWeb to see if it could help me approach it, actually.

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1 point by yariv 6496 days ago | link

Typo: different -> difference.

Also, the last two parameters should be in a list, i.e.

said(_Req) -> form(fun(Data) -> link(["you said: ", arg(Data, "foo")], "click here") end, [input("foo"), submit()]).

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1 point by partdavid 6494 days ago | link

I've been thinking about this challenge in terms of Erlang idioms and worked up a (very) minimal web framework using yaws. With SPEWF < http://code.google.com/p/spewf/ > this might look like:

 handle(_, [{said, Value}|_]) ->
 {Value, {ehtml, {a, [{href, self}], "click me"}}};
 handle(S, [_|R]) ->
 handle(S, R);
 handle([], []) ->
 {[], {ehtml, {form, [{action, self}],
 [{input, [{type, "text"},
 {name, "said"}, {size, 50}], []},
 {input, [{type, "submit"}]}]}}};
 handle(S, []) ->
 {S, {ehtml, {p, [], io_lib:format("you said: ~s", [S])}}}.

Like many of the other examples, it's lacking the clever HTML generation.

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