update with day04 and first puzzle of day05

day05/js/day05a.js

@@ -0,0 +1,80 @@
+import { promises as fsPromises } from "node:fs";
+
+async function asyncReadFile(filename) {
+    try {
+        const contents = await fsPromises.readFile(filename, "utf-8");
+
+        const arr = contents.split(/\r?\n/);
+
+        return arr;
+    } catch (err) {
+        console.error(err);
+    }
+}
+
+const parseData = (rows) => {
+    let isInRanges = true;
+    let freshRanges = [];
+    let freshCount = 0;
+
+    rows.forEach((row) => {
+        if (isInRanges) {
+            if (row === "") {
+                isInRanges = false;
+                return;
+            }
+
+            if (row.includes("-")) {
+                freshRanges.push(row);
+                /*
+                const [start, end] = row.split("-").map((val) => val * 1);
+                for (let i = start; i <= end; i++) {
+                    if (!freshIngredients.includes(i)) freshIngredients.push(i);
+                }
+                */
+                return;
+            }
+
+            if (/^\d+$/.matches(row) && !freshIngredients.includes(row * 1)) {
+                // freshIngredients.push(row * 1);
+                freshRanges.push(row);
+                return;
+            }
+            return;
+        }
+
+        let iNum = row * 1;
+        let isFresh = freshRanges.some((range) => {
+            if (!range.includes("-")) return range === `${iNum}`;
+            const [start, end] = range.split(/-/).map((val) => val * 1);
+            // console.log({ range, iNum, start, end });
+            return iNum >= start && iNum <= end;
+        });
+
+        if (isFresh) freshCount++;
+
+        console.log(`Ingredient ${row} is ${isFresh ? "fresh" : "spoiled"}.`);
+    });
+
+    return freshCount;
+};
+
+const testData = `
+3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32
+`.trim();
+
+// const rows = testData.split("\n");
+
+const rows = await asyncReadFile("../input.txt");
+
+console.log(`Fresh ingredient count: ${parseData(rows)}`);

day05/notes.md

@@ -0,0 +1,12 @@
+## Day 5: Cafeteria
+
+Puzzle 1 took me 30-ish minutes to figure out. I initially tried building an array of numbers from the ranges, but it turned out to be _much_ easier to parse each range against each value and let the machine do the math.
+
+Puzzle 2 seemed pretty straightforward, and I thought I had a simple solution, but it didn't work, and an hour later (1:30a), I have to admit defeat for tonight.
+
+### JS Solutions
+
+```
+cd js
+node day05a.js
+```