web: round values and add average

apps/web/src/utils/math.ts

@@ -0,0 +1,12 @@
+export const round = (num: number, decimals = 2) => {
+  const factor = Math.pow(10, decimals);
+  return Math.round((num + Number.EPSILON) * factor) / factor;
+};
+
+export const average = (arr: number[]) =>
+  arr.reduce((p, c) => p + c, 0) / arr.length;
+
+export const sum = (arr: number[]) =>
+  round(arr.reduce((acc, item) => acc + item, 0));
+
+export const isFloat = (n: number) => n % 1 !== 0;