source refactor

src/lib/utils.ts

@@ -0,0 +1,10 @@
+export function sum(numbers: Iterable<number>) {
+	let result = 0;
+	for (const item of numbers) result += item;
+	return result;
+}
+export async function parallel<I, O>(inputs: I[], operation: (item: I) => Promise<O>) {
+	const promises = [] as Promise<O>[];
+	for (const input of inputs) promises.push(operation(input));
+	return await Promise.all(promises);
+}