refactor: remove lodash

src/app/_helpers/collections/group-by.ts

@@ -0,0 +1,39 @@
+/*
+ * 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/>.
+ */
+
+/**
+ * Group an array by a function
+ */
+export function groupBy<T>(
+  collection: T[],
+  group: (item: T) => string | undefined,
+): Record<string, T[]> {
+  return collection.reduce((accumulator: Record<string, T[]>, item) => {
+    const key = group(item) || '';
+    accumulator[key] = accumulator[key] ?? [];
+    accumulator[key].push(item);
+    return accumulator;
+  }, {});
+}
+
+/**
+ *
+ */
+export function groupByProperty<T extends object>(
+  collection: T[],
+  property: keyof T,
+): Record<string, T[]> {
+  return groupBy(collection, item => item[property] as unknown as string);
+}