Implement dropLast/takeLast

src/collection/reduce.ts

@@ -3,8 +3,8 @@ import {error} from "../util/error";
 export function reduce<T>(value: T[], accumulate: (acc: T, it: T) => T): T {
     if (value.length === 0) error();
     let acc = value[0];
-    for (let index = 1; index < value.length; index++) {
-        acc = accumulate(acc, value[index]);
+    for (let i = 1; i < value.length; i++) {
+        acc = accumulate(acc, value[i]);
     }
     return acc;
 }