Implement Seconds.add()

src/Seconds.ts

@@ -1,3 +1,7 @@
 export class Seconds {
   constructor(readonly value: number) {}
+
+  add(other: Seconds): Seconds {
+    return new Seconds(this.value + other.value);
+  }
 }

src/detectRepeats.ts

@@ -34,7 +34,7 @@ const countRepetitions = (reference: Interval[], intervals: Interval[], startInd
 
 const offsetComments = (interval: Interval, baseOffset: Seconds): Comment[] => {
   return interval.comments.map(({ offset, ...rest }) => ({
-    offset: new Seconds(baseOffset.value + offset.value),
+    offset: baseOffset.add(offset),
     ...rest,
   }));
 };
@@ -44,7 +44,7 @@ const collectComments = (intervals: Interval[]): Comment[] => {
   return flatten(
     intervals.map((interval) => {
       const comments = offsetComments(interval, previousIntervalsDuration);
-      previousIntervalsDuration = new Seconds(previousIntervalsDuration.value + interval.duration.value);
+      previousIntervalsDuration = previousIntervalsDuration.add(interval.duration);
       return comments;
     }),
   );

src/stats/totalDuration.ts

@@ -1,6 +1,5 @@
-import { map, sum } from "ramda";
 import { Interval } from "../ast";
 import { Seconds } from "../Seconds";
 
 export const totalDuration = (intervals: Interval[]): Seconds =>
-  new Seconds(sum(map((interval) => interval.duration.value, intervals)));
+  intervals.reduce((total, interval) => total.add(interval.duration), new Seconds(0));