You’re right - the macro seemed superfluous - I just didn’t know in what way … so this works:
defmodule Demo do
@demo_map %{a: 1}
def subset?(super_map) do
case super_map do
@demo_map ->
true
_ ->
false
end
end
def subset2?(super_map) do
try do
@demo_map = super_map
true
catch
:error, {:badmatch, _} ->
false
end
end
def subset3?(@demo_map = _super_map), do: true
def subset3?(_), do: false
def a,
do: @demo_map
def with_fun(subset) do
fn {k,v} ->
IO.puts("a ⊆ #{Atom.to_string(k)}: #{subset.(v)}")
end
end
def with_fun({title, list}, fun) do
IO.puts(title)
Enum.each(list, with_fun(fun))
end
end
check_list = [a: Demo.a, b: %{a: 1, b: 2}, c: %{c: 3}, e: %{}]
Demo.with_fun({"--- subset? ", check_list}, &Demo.subset?/1)
Demo.with_fun({"--- subset2? ", check_list}, &Demo.subset2?/1)
Demo.with_fun({"--- subset3? ", check_list}, &Demo.subset3?/1)
