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altworx_utils

0.0.5
0.0.5 0.0.4 0.0.2 0.0.1

A collection of common utility functions for various situations.

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altworx_utils src aw_list_utils.erl
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src/aw_list_utils.erl 

%%%-------------------------------------------------------------------

%%% @author Adam Kovari <adam.kovari@altworx.com>

%%% @copyright (C) 2016, Altworx s.r.o.

%%% @doc

%%%

%%% @end

%%%-------------------------------------------------------------------

-module(aw_list_utils).



-export([mapfirst/3]).



-ifdef(TEST).

-include_lib("eunit/include/eunit.hrl").

-endif.



%%--------------------------------------------------------------------

%% @doc Map a function over the first element matching a filter

%% @end

%%--------------------------------------------------------------------

-spec mapfirst(MapF :: fun((E) -> Res), FilterF :: fun((E) -> boolean()), L :: [E]) -> Res | nomatch.

mapfirst(MapF, FilterF, [H | T]) ->

    case FilterF(H) of

        true -> MapF(H);

        false -> mapfirst(MapF, FilterF, T)

    end;

mapfirst(_MapF, _FilterF, []) ->

    nomatch.