Restructure folders and add day 3's solution

javascript/day_01/part1.mjs

@@ -1,5 +1,5 @@
 import { readFile } from "fs/promises";
-import { SortedList } from "../../utils/javascript/SortedList.mjs";
+import { SortedList } from "../utils/javascript/SortedList.mjs";
 
 
 const fileToRead = `actual.input`;

javascript/day_02/part1.mjs

@@ -0,0 +1,36 @@
+import { readFile } from "fs/promises";
+
+function legalValues(a, b, gap) {
+	const delta = Math.abs(a - b);
+	console.log(`legaValues(${a}, ${b}, ${gap}){delta=${delta}} = ${delta <= gap}`);
+	return delta <= gap;
+};
+
+if (process.argv.length <= 2) {
+	console.error(`Needs more args >:(`).
+	process.exit(1);
+}
+
+const fileToRead = process.argv[2];
+const file = await readFile(fileToRead, `utf-8`);
+
+let validLines = 0;
+for (const line of file.split(`\n`)) {
+	// console.log(line)
+	const ints = line.split(` `)
+		.map(v => Number.parseInt(v));
+
+	const isSafe = ints
+		.slice(0, -1)
+		.map((v, i) => v - ints[i + 1])
+		.every((v, _, a) => Math.sign(v) === Math.sign(a[0]) && Math.abs(v) <= 3);
+
+	// console.log(isSafe)
+
+	if(isSafe) {
+		validLines++;
+	};
+	// break
+};
+
+console.log(`Number of valid reports:`, validLines)

javascript/day_02/part2.mjs

@@ -0,0 +1,51 @@
+import { readFile } from "fs/promises";
+
+if (process.argv.length <= 3) {
+	console.error(`Needs more args >:(`);
+	process.exit(1);
+}
+
+const fileToRead = process.argv[2];
+const gap = parseInt(process.argv[3])
+const file = await readFile(fileToRead, `utf-8`);
+
+let validLines = 0;
+for (const line of file.split(`\n`)) {
+	// console.log(line)
+	const ints = line.split(` `)
+		.map(v => Number.parseInt(v))
+		// .reverse()
+
+	let isValid = true;
+	let errorCorrected = false;
+	let firstSign = null;
+	let firstIter = true;
+	for (var i = 0; i < ints.length - 1; i++) {
+		const a = ints[i];
+		const b = ints[i + 1];
+
+		const sign = Math.sign( a - b );
+		const delta = Math.abs( a - b );
+
+		firstSign ??= sign;
+
+		const rightDirection = sign === firstSign;
+		const deltaWithinRange = delta <= gap;
+
+		if (!rightDirection || !deltaWithinRange) {
+			isValid &&= !errorCorrected;
+			if (!isValid) {
+				break;
+			}
+			errorCorrected = true;
+			ints.splice(i , 1);
+			i--;
+			continue;
+		}
+		firstIter = false;
+	};
+	console.log({ firstSign, isValid, errorCorrected, ints })
+	if (isValid) validLines++;
+};
+
+console.log(`Number of valid reports:`, validLines);

javascript/day_03/solution.mjs

@@ -0,0 +1,35 @@
+import { readFile } from "fs/promises";
+
+if (process.argv.length <= 2) {
+	console.error(`Needs more args >:(`).
+	process.exit(0);
+}
+
+const fileToRead = process.argv[2];
+const file = await readFile(fileToRead, `utf-8`);
+
+const pattern = /(?<cmd>mul|do|don't)\(((?<a>\d{1,3}),(?<b>\d{1,3}))?\)/g;
+
+const commands = file.matchAll(pattern);
+
+let part1Sum = 0;
+let part2Sum = 0;
+let enabled = true
+for (const command of commands) {
+	const { cmd, a, b } = command.groups;
+
+	switch (cmd) {
+		case "do": enabled = true; break
+		case "don't": enabled = false; break
+		case "mul": {
+			part1Sum += a * b;
+			if (enabled) {
+				part2Sum += a * b;
+			}
+			break;
+		}
+	}
+};
+
+console.log(`Part 1 Answer: ${part1Sum}`);
+console.log(`Part 2 Answer: ${part2Sum}`);