Takes a map and callback function. Runs reduce. Removes the :meta field from iteration, but not from accumulator.

opts:

• iteratemeta = bool(false). whether to allow :_meta
• index = bool(false). whether to pass index into cb
• template = atom. Check permissions and hide if necessary.
• path = list of atoms. similar to put_in, runs cb at deeper part of m
• acc = set a custom accumulator. Defaults to map (at path)

Examples

iex> m = %{dogs: %{name: :string}}
iex> cb = fn ({tablekey, table}, acc) -> acc end
iex> itr(_, m, cb)
%{dogs: %{name: :string}}

iex> cb = fn ({tablekey, table, index}, acc) -> acc end
iex> itr(_, m, cb, %{index: true})
%{dogs: %{name: :string}}

iex> cb = fn ({k, v}, acc) -> Map.put(acc, :hello, "world") end
iex> m = %{a: %{b: %{c: %{d: "e"}}}}
iex> itr(_, m, cb, %{path: [:a, :b, :c]})
%{a: %{b: %{c: %{d: "e", hello: "world"}}}}