Add 2024/day3/part2.js

2024/day3/part2.js

@@ -0,0 +1,25 @@
+#!/usr/bin/env node
+
+var content = require('fs').readFileSync(process.argv[2],'utf8');
+//content = `do()${content}don't()`;
+//var doregex = /do\(\).+don't\(\)/g
+var mulregex = /mul\((\d{1,3}),(\d{1,3})\)/g
+var numregex = /\d+/g
+
+//var blocks = content.match(doregex);
+
+function content2sum(content) {
+ var muls = content.match(mulregex);
+ var sum=0;
+ for(var mul of muls) {
+  var digits = mul.match(numregex);
+  var values = digits.map(i=>parseInt(i));
+  //console.log({digits,values});
+  sum+=values[0]*values[1];
+ }
+ return sum;
+}
+var sum=content.split('do()').map(i=>i.split("don't()")[0]).map(content2sum).reduce((a,b)=>a+b);
+
+
+console.log('Result:',sum);