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fix: timetable dates cannot be removed

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This commit is contained in:
Thea Schöbl
2022-05-03 11:06:06 +00:00
committed by Rainer Killinger
parent 29585faff6
commit 9242438132
7 changed files with 134 additions and 19 deletions
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25
src/app/_helpers/collections/difference.spec.ts Normal file
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@@ -0,0 +1,25 @@
/*
* Copyright (C) 2022 StApps
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, version 3.
*
* 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
import {differenceBy} from './difference';
describe('differenceBy', function () {
it('should return the difference of two arrays', function () {
const a = [1, 2, 3, 4, 5];
const b = [1, 2, 3];
expect(differenceBy(a, b, it => it)).toEqual([4, 5]);
});
});

27
src/app/_helpers/collections/difference.ts Normal file
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@@ -0,0 +1,27 @@
/*
* Copyright (C) 2022 StApps
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, version 3.
*
* 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
/**
* Returns the difference between two arrays.
*/
export function differenceBy<T>(
a: T[],
b: T[],
transform: (item: T) => unknown,
) {
const disallowed = new Set(b.map(transform));
return a.filter(item => !disallowed.has(transform(item)));
}

2
src/app/_helpers/collections/group-by.ts
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@@ -21,7 +21,7 @@ export function groupBy<T>(
group: (item: T) => string | undefined,
): Record<string, T[]> {
return collection.reduce((accumulator: Record<string, T[]>, item) => {
const key = group(item) || '';
const key = group(item) ?? '';
accumulator[key] = accumulator[key] ?? [];
accumulator[key].push(item);
return accumulator;

26
src/app/_helpers/collections/uniq.spec.ts Normal file
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@@ -0,0 +1,26 @@
/*
* Copyright (C) 2022 StApps
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, version 3.
*
* 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
import {uniqBy} from './uniq';
describe('uniq', function () {
it('should return an array with unique values', function () {
const array = [
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
];
const result = uniqBy(array, it => it);
expect(result).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
});
});

29
src/app/_helpers/collections/uniq.ts Normal file
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@@ -0,0 +1,29 @@
/*
* Copyright (C) 2022 StApps
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, version 3.
*
* 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
/**
* Filter out duplicates from an array.
*/
export function uniqBy<T>(
array: T[],
transform: (item: T) => string | number,
): T[] {
return Object.values(
array.reduce((accumulator, current) => {
accumulator[transform(current)] = current;
return accumulator;
}, {} as Record<string | number, T>),
);
}