[erlang-questions] Bound(?) var in anonymous fun

[Pablo Vieytes]

I want to delete an item from a list and I've written this fun.


delete_key_from_list(Key, StatusList)->
    lists:foldr(
      fun(Key, Acc) ->
      Acc;
 (Another, Acc) ->
      [Another|Acc]
      end,
      [],
      StatusList).

src/file.erl:172: Warning: variable 'Key' is unused
src/file.erl:174: Warning: variable 'Key' is unused
src/file.erl:174: Warning: variable 'Key' shadowed in 'fun'
src/file.erl:176: Warning: this clause cannot match because a previous
clause at line 174 always matches


I guessed Key was bound so I could use for pattern matching. It's very easy
to fix it but I don't know why it doesn't work.


Fixed version:


delete_key_from_list(Key, StatusList)->
    lists:foldr(
      fun(K, Acc) when K == Key ->
      Acc;
 (Another, Acc) ->
      [Another|Acc]
      end,
      [],
      StatusList).
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20121218/aaeaa75f/attachment.htm>