e r l a n g : c o o k b o o k

1> Dict = dict:from_list([{1,"foo"}, {2,"bar"}, {3,"baz"}]).
[ ... ]
2> Dict2 = dict:erase(2, Dict).
{dict,2,
      16,
      16,
      8,
      80,
      48,
      {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},
      {{[],[[3,"baz"]],[],[],[],[],[],[],[],[],[], 
        [[1,"foo"]],[],[],[],[]}}}
4> dict:is_key(2, Dict2).
false

4> MyETS = ets:new('Cookbook', []).
16
5> ets:insert(MyETS, {1, "foo"}).
true
6> ets:insert(MyETS, {2, "bar"}).
true
7> ets:insert(MyETS, {3, "baz"}).
true
8> ets:delete(MyETS, 2).
true
9> ets:member(MyETS, 2). 
false