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A Utilitary package functionalities modules for improve a secure performatic development.
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lib/krug/struct/keypar.list.ex
defmodule Krug.KeyParList do
@moduledoc """
Module to handle list of single maps of key/value entries.
"""
alias Krug.MapUtil
@doc """
Obtains a value respective to a ```key``` in keypar list.
If none of elements contains the key received, return nil.
"""
def get(key,list) do
cond do
(nil == list or length(list) == 0) -> nil
(list |> hd() |> MapUtil.get(:key) == key) -> list |> hd() |> MapUtil.get(:value)
true -> get(key,list |> tl())
end
end
@doc """
Insert a key/value entry in a list. Creates a new entry if not exists
a respective key. Otherwise replace the existing key/value entry.
"""
def put(key,value,list) do
cond do
(nil == list or length(list) == 0) -> [%{key: key, value: value}]
true -> put_not_empty(key,value,list,0)
end
end
defp put_not_empty(key,value,list,counter) do
cond do
(nil == list or length(list) == 0) -> [%{key: key, value: value} | list]
(list |> Enum.at(counter) |> MapUtil.get(:key) == key)
-> List.replace_at(list,counter,%{key: key, value: value})
true -> put_not_empty(key,value,list,counter + 1)
end
end
end