44 lines
1.1 KiB
Elixir
44 lines
1.1 KiB
Elixir
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defmodule Todo.List do
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defstruct entries: %{}, next_id: 1
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def new(entries \\ []) do
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Enum.reduce(entries, %__MODULE__{}, &add(&2, &1))
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end
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def add(
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%__MODULE__{entries: entries, next_id: next_id} = todo_list,
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%{date: _, title: _} = entry
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) do
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new_entry = Map.put(entry, :id, next_id)
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new_entries = Map.put(entries, next_id, new_entry)
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%__MODULE__{todo_list | entries: new_entries, next_id: next_id + 1}
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end
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def entries(%__MODULE__{} = todo_list, date) do
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todo_list.entries
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|> Map.filter(fn {_, entry} -> entry.date == date end)
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|> Map.values()
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end
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def update(%__MODULE__{entries: entries} = todo_list, id, update_fun)
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when is_function(update_fun, 1) do
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case Map.fetch(entries, id) do
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:error ->
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todo_list
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{:ok, entry} ->
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new_entry = update_fun.(entry)
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new_entries = Map.put(entries, id, new_entry)
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%__MODULE__{todo_list | entries: new_entries}
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end
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end
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def delete(%__MODULE__{entries: entries} = todo_list, id) when is_number(id) do
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new_entries = Map.delete(entries, id)
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%__MODULE__{todo_list | entries: new_entries}
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end
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end
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