refactor: remove lodash

src/app/_helpers/collections/sum.ts

@@ -0,0 +1,37 @@
+/*
+ * 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/>.
+ */
+
+/**
+ * Sum an an array
+ */
+export function sumBy<T extends object>(
+  collection: T[],
+  transform: (value: T) => number | undefined,
+): number {
+  return collection.reduce(
+    (accumulator, item) => accumulator + (transform(item) || 0),
+    0,
+  );
+}
+
+/**
+ * Sum an array of numbers
+ */
+export function sum(collection: Array<number | undefined>): number {
+  return collection.reduce<number>(
+    (accumulator, item) => accumulator + (item || 0),
+    0,
+  );
+}