MapSet parsing problems

[boxxxie]

i write out a mapset to edn, then read it back from edn, and they don't look the same

edn

[#{{<<"Ahmad Abdalla">>,<<"Natasha Taylor">>} {<<"Dave Hurley">>,<<"Ken Ip">>} {<<"Eric  Arnold">>,<<"Paul Iannazzo">>} {<<"Eric Rogness">>,<<"Kim Ghattoura">>} {<<"Harry  McLaughlin">>,<<"Sam Holako">>} {<<"Izzie Colpitts-Campbell">>,<<"Olaf  Arason">>} {<<"Lauren Arnold">>,<<"Michael Rowe">>} {<<"Michael Wickware">>,<<"Naomi Cowan">>} {<<"Quinn  Strahl">>,<<"Robert Peacock">>}} #{{<<"Ahmad Abdalla">> ...

when i read it back in i get

{:ok,
 [#MapSet<[%{{:symbol, :"<<"} => "Dave Hurley",
     {:symbol, :">>"} => {:symbol, :"<<"}, "Ken Ip" => {:symbol, :">>"}},
   %{{:symbol, :"<<"} => "Eric Rogness", {:symbol, :">>"} => {:symbol, :"<<"},
     "Kim Ghattoura" => {:symbol, :">>"}},
   %{{:symbol, :"<<"} => "Lauren Arnold", {:symbol, :">>"} => {:symbol, :"<<"},
     "Michael Rowe" => {:symbol, :">>"}},
   %{{:symbol, :"<<"} => "Michael Wickware" ...

i don't understand why there are << and >> in my file. seems like very erlang like things.
i expect the output to be only edn format,

[psfblair]

How are you printing out the output? Note that Elixir has two string formats, one of which is called a binary (see http://elixir-lang.org/getting-started/binaries-strings-and-char-lists.html). If you are using iex to output the edn you'll get the angle-bracket notation because the strings are in binary format.

However, just outputting the edn to a variable and then reading back in from that variable shouldn't give you the problem you see. (I believe there are tests that establish that.) If that's a problem, then there's something wrong.

I believe IO.puts will give you a string output that doesn't contain the angle brackets.

[boxxxie]

could an issue be that I'm using tuples?

[psfblair]

I don't believe there is any conversion from Elixir tuples to edn, since edn doesn't have a tuple type.

However, the angle brackets almost certainly comes from the way Elixir represents a binary string format when inspected. You'll get those if you write to edn in a format that doesn't recognize those as strings, and then when you attempt to read back the serialized edn with the angle brackets you'll get the problem you see.

[boxxxie]

Thanks for your replies. i've stopped using tuples. :)