Extract average()

src/average-intensity.ts

@@ -1,9 +1,8 @@
-import { pipe, sum } from "ramda";
+import { pipe } from "ramda";
 import { Interval } from "./ast";
+import { average } from "./average";
 import { intervalsToIntensities } from "./intervalsToIntensities";
 
-const average = (arr: number[]) => sum(arr) / arr.length;
-
 export const averageIntensity = (intervals: Interval[]): number => {
   return pipe(intervalsToIntensities, average)(intervals);
 };

src/average.ts

@@ -0,0 +1,3 @@
+import { sum } from "ramda";
+
+export const average = (arr: number[]) => sum(arr) / arr.length;

src/normalized-intensity.ts

@@ -1,5 +1,6 @@
 import { pipe, sum } from "ramda";
 import { Interval } from "./ast";
+import { average } from "./average";
 import { intervalsToIntensities } from "./intervalsToIntensities";
 
 // Starting at the beginning of the data, calculate 30-second rolling average
@@ -23,8 +24,6 @@ const fourthPower = (x: number) => Math.pow(x, 4);
 
 const fourthRoot = (x: number) => Math.pow(x, 1 / 4);
 
-const average = (arr: number[]) => sum(arr) / arr.length;
-
 export const normalizedIntensity = (intervals: Interval[]): number => {
   return pipe(
     intervalsToIntensities,