Elixir pattern matching in `for` loop

for_pattern_match.ex

items = [%{id: 1, deleted: false}, %{id: 2, deleted: true}, %{id: 3, deleted: false}]

for item <- items do
  IO.puts Map.fetch!(item, :id)
end
# 1
# 2
# 3
# [:ok, :ok, :ok]

for %{deleted: false} = item <- items do
  IO.puts Map.fetch!(item, :id)
end
# 1
# 3
# [:ok, :ok]