1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/*
* SonarQube
* Copyright (C) 2009-2016 SonarSource SA
* mailto:contact AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
// Author: Christoffer Niska <christofferniska@gmail.com>
// https://gist.github.com/crisu83/42ecffccad9d04c74605fbc75c9dc9d1
import uniq from 'lodash/uniq';
/**
* Creates a reducer that manages a single value.
*
* @param {function(state, action)} shouldUpdate
* @param {function(state, action)} shouldReset
* @param {function(state, action)} getValue
* @param {*} defaultValue
* @returns {function(state, action)}
*/
export const createValue = (
shouldUpdate = () => true,
shouldReset = () => false,
getValue = (state, action) => action.payload,
defaultValue = null
) => (state = defaultValue, action = {}) => {
if (shouldReset(state, action)) {
return defaultValue;
}
if (shouldUpdate(state, action)) {
return getValue(state, action);
}
return state;
};
/**
* Creates a reducer that manages a map.
*
* @param {function(state, action)} shouldUpdate
* @param {function(state, action)} shouldReset
* @param {function(state, action)} getValues
* @returns {function(state, action)}
*/
export const createMap = (
shouldUpdate = () => true,
shouldReset = () => false,
getValues = (state, action) => action.payload
) => createValue(shouldUpdate, shouldReset, (state, action) =>
({ ...state, ...getValues(state, action) }), {});
/**
* Creates a reducer that manages a set.
*
* @param {function(state, action)} shouldUpdate
* @param {function(state, action)} shouldReset
* @param {function(state, action)} getValues
* @returns {function(state, action)}
*/
export const createSet = (
shouldUpdate = () => true,
shouldReset = () => false,
getValues = (state, action) => action.payload
) => createValue(shouldUpdate, shouldReset, (state, action) =>
uniq([...state, ...getValues(state, action)]), []);
/**
* Creates a reducer that manages a flag.
*
* @param {function(state, action)} shouldTurnOn
* @param {function(state, action)} shouldTurnOff
* @param {bool} defaultValue
* @returns {function(state, action)}
*/
export const createFlag = (shouldTurnOn, shouldTurnOff, defaultValue = false) =>
(state = defaultValue, action = {}) => {
if (shouldTurnOn(state, action)) {
return true;
}
if (shouldTurnOff(state, action)) {
return false;
}
return state;
};
|
