Solve D06P02

day06/part2.ts

···
+import { readFileSync } from "fs";
+
+let input = readFileSync("./input.txt", "utf8").split(/\n/);
+
+const operatorIndices = [...input[input.length - 1].matchAll(/\*|\+/g)].map(
+	(match) => match.index
+);
+const tokenizedInput = input.map((line) => {
+	const output = [];
+
+	for (let i = 0; i < operatorIndices.length; i++) {
+		output.push(
+			line.slice(
+				operatorIndices[i],
+				i + 1 < operatorIndices.length
+					? operatorIndices[i + 1]
+					: line.length
+			)
+		);
+	}
+
+	return output;
+});
+
+const mathProblems = new Array(tokenizedInput[0].length)
+	.fill(null)
+	.map((n) => [] as any);
+
+for (let i = 0; i < tokenizedInput.length; i++) {
+	for (let j = 0; j < tokenizedInput[i].length; j++) {
+		mathProblems[j].push(tokenizedInput[i][j]);
+	}
+}
+
+let answersSum = 0;
+
+for (let mathProblem of mathProblems) {
+	const mp = new Array(mathProblem[0].length)
+		.fill(null)
+		.map(() => [] as string[]);
+
+	for (let i = 0; i < mathProblem.length - 1; i++) {
+		for (let j = 0; j < mathProblem[i].length; j++) {
+			mp[j].push(mathProblem[i][j] ? mathProblem[i][j] : "");
+		}
+	}
+
+	mathProblem = {
+		operands: mp
+			.map((tokens) => tokens.join("").trim())
+			.filter(Boolean)
+			.map(Number),
+		operator: mathProblem[mathProblem.length - 1].trim()
+	};
+
+	answersSum +=
+		mathProblem.operator === "+"
+			? mathProblem.operands.reduce((a: any, c: any) => a + c, 0)
+			: mathProblem.operands.reduce((a: number, c: number) => a * c, 1);
+}
+
+console.log(answersSum);