1 files changed, 45 insertions, 0 deletions
diff --git a/2022/21-Monkey-Math/first.js b/2022/21-Monkey-Math/first.js
new file mode 100644
index 0000000..b6da414
--- /dev/null
+++ b/2022/21-Monkey-Math/first.js
@@ -0,0 +1,45 @@
+import * as fs from "fs";
+
+const simple = /(\w+): (\d+)/;
+const operation = /(\w+): (\w+) ([+\-*/]) (\w+)/;
+
+function load(filename) {
+	let res = {};
+	fs.readFileSync(filename, "utf8")
+		.trim()
+		.split("\n")
+		.forEach(line => {
+			const s = line.match(simple);
+			if (s) {
+				res[s[1]] = function() { return parseInt(s[2]); };
+			} else {
+				const o = line.match(operation);
+				res[o[1]] = function () {
+					let left = res[o[2]]();
+					let right = res[o[4]]();
+					switch(o[3]) {
+					case "+": return left + right;
+					case "-": return left - right;
+					case "*": return left * right;
+					case "/": return left / right;
+					}
+				};
+			}
+		});
+	return res;
+}
+
+let example = load("example");
+let input = load("input");
+
+function solve(input) {
+	return input["root"]();
+}
+
+const exampleOutput = solve(example);
+if (exampleOutput !== 152) {
+	console.log("Example failed with " + exampleOutput);
+	process.exit(1); // eslint-disable-line
+}
+
+console.log(solve(input));