From f8cf05425ae6de274f095b1101d79e1291722321 Mon Sep 17 00:00:00 2001
From: Tim Stallard <code@timstallard.me.uk>
Date: Fri, 16 Dec 2016 07:24:15 +0000
Subject: [PATCH] Day 16

---
 day16/part1.js | 14 ++++++++++++++
 day16/part2.js | 15 +++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 day16/part1.js
 create mode 100644 day16/part2.js

diff --git a/day16/part1.js b/day16/part1.js
new file mode 100644
index 0000000..f9a4771
--- /dev/null
+++ b/day16/part1.js
@@ -0,0 +1,14 @@
+curve = (state)=>(state + "0" + state.split("").reverse().map((char)=>((char == "0") ? "1" : "0")).join(""));
+curveLoop = (str, len)=>{
+  next = curve(str);
+  return (next.length >= len) ? (next.substr(0, len)) : curveLoop(next, len);
+};
+checksum = (str)=>(str.split("").reduce((a, b, i, arr)=>{
+  if(i%2 == 0){
+    a.push([b, arr[i+1]]);
+  }
+  return a;
+}, [])).map((pair)=>((pair[0] == pair[1]) ? "1" : "0")).join("");
+checksumLoop = (str) => {var sum = checksum(str); return (sum.length%2 == 0) ? (checksumLoop(sum)) : (sum)}
+
+console.log(checksumLoop(curveLoop("01000100010010111", 272)));
diff --git a/day16/part2.js b/day16/part2.js
new file mode 100644
index 0000000..7d1e8c5
--- /dev/null
+++ b/day16/part2.js
@@ -0,0 +1,15 @@
+curve = (state)=>(state + "0" + state.split("").reverse().map((char)=>((char == "0") ? "1" : "0")).join(""));
+curveLoop = (str, len)=>{
+  next = curve(str);
+  console.log(next.length);
+  return (next.length >= len) ? (next.substr(0, len)) : curveLoop(next, len);
+};
+checksum = (str)=>(str.split("").reduce((a, b, i, arr)=>{
+  if(i%2 == 0){
+    a.push([b, arr[i+1]]);
+  }
+  return a;
+}, [])).map((pair)=>((pair[0] == pair[1]) ? "1" : "0")).join("");
+checksumLoop = (str) => {var sum = checksum(str); return (sum.length%2 == 0) ? (checksumLoop(sum)) : (sum)}
+
+console.log(checksumLoop(curveLoop("01000100010010111", 35651584)));