From ad8e0fe91fba37e61a913cc6dd67028c26cac373 Mon Sep 17 00:00:00 2001
From: Piotr Russ <mail@pruss.it>
Date: Fri, 18 Dec 2020 12:35:42 +0100
Subject: day18

---
 day18/day18-1.js | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 day18/day18-1.js

(limited to 'day18/day18-1.js')

diff --git a/day18/day18-1.js b/day18/day18-1.js
new file mode 100644
index 0000000..992da27
--- /dev/null
+++ b/day18/day18-1.js
@@ -0,0 +1,22 @@
+const data = require('./data')
+const lines = data.split(/\n/g).filter(Boolean)
+
+const ev = (str) => {
+  let spl = str.split(' ')
+  while(spl.length > 1) {
+    spl = [eval(spl.slice(0, 3).join(''))].concat(spl.slice(3))
+  }
+  return spl[0]
+}
+
+const evPar = (str) => {
+  while(/\(/.test(str)) {
+    str = str.replace(/\(([^()]+)\)/g, (match, par) => ev(par))
+  }
+  return ev(str)
+}
+
+let sum = 0
+lines.forEach(l => sum += evPar(l))
+console.log('Answer: ', sum)
+
-- 
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