simplify

2023/day_01/solution.ts

@@ -25,7 +25,7 @@ In this example, the calibration values of these four lines are 12, 38, 15, and
 Consider your entire calibration document. What is the sum of all of the calibration values?
 */
 
-import { sum } from "../../_utils";
+import { sum, allIndicesOf } from "../../_utils";
 
 const extractDigits = (s: string): string => s.replaceAll(/[a-zA-Z]/g, "");
 const firstLast = (s: string): number => +`${s[0]}${s[s.length - 1]}`;
@@ -70,22 +70,6 @@ const digits = [
   "nine",
 ];
 
-const allIndicesOf = (s: string, search: string): number[] => {
-  let results = [];
-  let lastResult = -1;
-  while (lastResult <= s.length) {
-    const newResult = s.indexOf(search, lastResult + 1);
-    if (newResult == -1) {
-      break;
-    } else {
-      results.push(newResult);
-      lastResult = newResult;
-    }
-  }
-
-  return results;
-};
-
 type Match = {
   digitNum: number;
   startPos: number;

_utils/index.ts

@@ -63,3 +63,21 @@ export function sum(a: number, b: number): number {
 export function emptyLines(line?: string): boolean {
   return !!line;
 }
+
+export function unique<T>(arr: T[]): T[] {
+  return arr.reduce<T[]>((res, current) => {
+    if (res.includes(current)) {
+      return res;
+    } else {
+      return [...res, current];
+    }
+  }, []);
+}
+
+export function allIndicesOf(s: string, search: string): number[] {
+  return unique(
+    s
+      .split("")
+      .reduce((results, _, index) => [...results, s.indexOf(search, index)], [])
+  ).filter((x: number) => x >= 0);
+}