[erlang-questions] [ANN] SeqBind, Sequential Binding Parse Transformation for Erlang (Experimental)

Tristan Sloughter <>
Mon Jan 16 18:47:38 CET 2012


>
> When I write code like that (instead of just inlining all the arguments
> like a good functional programmer), I do that because I want to be able to
> inspect L1 and L2 in the debugger.


Agreed.

But its also a problem of Erlang verbosity as compared to say:

map (1+) $ filter (== 2) [1,2,3,4,2]

Sometimes its clearer in Erlang to use the sequence method of L1, L2, etc
simply so what is happening is more clear then defining a number of
anonymous functions or doing:

lists:map(fun(X) -> X +1 end, lists:filter(fun(X) -> X == 2 end, List)

or

[X + 1 || X <- lists:filter(fun(X) -> X == 2 end, List)]

Though, my real favorite solution may be for Erlang to be able to do:

modify_list(List) ->
  G(H(List)
  where
    G(List) -> lists:map(fun(X) -> X +1 end, List);
    H(List) -> lists:filter(fun(X) -> X == 2 end, List)
  end
end

Tristan
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