From 7160b4fa784d47159227360cce89c2ec8ce99ea3 Mon Sep 17 00:00:00 2001
From: Yanick Champoux <yanick@babyl.ca>
Date: Mon, 6 Dec 2021 11:25:43 -0500
Subject: [PATCH] 2021-06

---
 2021/06/part1.mjs | 22 ++++++++++++++++++++++
 2021/06/test.mjs  | 18 ++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 2021/06/part1.mjs
 create mode 100644 2021/06/test.mjs

diff --git a/2021/06/part1.mjs b/2021/06/part1.mjs
new file mode 100644
index 0000000..8cb10ec
--- /dev/null
+++ b/2021/06/part1.mjs
@@ -0,0 +1,22 @@
+import fs from "fs-extra";
+import fp from "lodash/fp.js";
+import _ from "lodash";
+
+export const processInput = (input) =>
+    input.split(',').map( x => parseInt(x) );
+
+export function solution(input,days = 80) {
+    let fish = Array.from({length:8}, ()=>0);
+    input.forEach( x => fish[x]++ );
+
+    for( let i = 0; i< days; i++ ) {
+        const breeders = fish.shift();
+        if(breeders ) {
+            fish[8] = breeders;
+            fish[6] = (fish[6] || 0)  + breeders;
+        }
+   //     console.log(fish);
+    }
+
+    return _.sum(fish);
+};
diff --git a/2021/06/test.mjs b/2021/06/test.mjs
new file mode 100644
index 0000000..120b721
--- /dev/null
+++ b/2021/06/test.mjs
@@ -0,0 +1,18 @@
+import tap from "tap";
+import fs from "fs-extra";
+
+import * as p1 from "./part1.mjs";
+
+const sample = p1.processInput("3,4,3,1,2");
+const input = fs.readFile("input", "utf8").then(p1.processInput);
+
+tap.test("part1", async (t) => {
+    t.equal(p1.solution(await sample, 18), 26);
+    t.equal(p1.solution(await sample), 5934);
+    t.equal(p1.solution(await input), 358214);
+});
+
+tap.test("part2", async (t) => {
+    t.equal(p1.solution(await sample, 256), 26984457539);
+    t.equal(p1.solution(await input, 256), 1622533344325);
+});