diff --git a/05/code.js b/05/code.js
new file mode 100644
index 0000000..a6dadbd
--- /dev/null
+++ b/05/code.js
@@ -0,0 +1,97 @@
+import { readFileSync } from 'node:fs';
+
+let sampleMode = false;
+let usedArray = [];
+
+const sampleArray = readFileSync('sample.txt').toString().split("\n");
+const inputArray = readFileSync('input.txt').toString().split("\n");
+
+if (sampleMode) {
+  usedArray = sampleArray;
+} else {
+  usedArray = inputArray;
+}
+
+// Part One
+
+console.time("part1");
+
+const ranges = [];
+const ingredients = [];
+const validIngredients = [];
+
+for (const element of usedArray) {
+  if (element.includes("-")) {
+    const contents = element.split("-");
+    const start = Number.parseInt(contents[0]);
+    const end = Number.parseInt(contents[1]);
+    ranges.push({ start, end });
+  } else if (element !== "") {
+    ingredients.push(Number.parseInt(element));
+  }
+}
+
+for (const ingredient of ingredients) {
+  for (const range of ranges) {
+    if (ingredient >= range.start && ingredient <= range.end) {
+      validIngredients.push(ingredient);
+      break;
+    }
+  }
+}
+
+console.timeEnd("part1");
+console.log(validIngredients.length);
+
+
+// Part Two
+
+console.time("part2");
+
+const ranges2 = [];
+
+for (const element of usedArray) {
+  if (element.includes("-")) {
+    const contents = element.split("-");
+    const start = Number.parseInt(contents[0]);
+    const end = Number.parseInt(contents[1]);
+    ranges2.push({ start, end });
+  }
+}
+
+ranges2.sort((a, b) => a.start - b.start);
+let processing = true;
+
+while (processing) {
+  compactRanges();
+}
+
+// Five more times for fun, just in case
+for (let i = 0; i < 5; i++) {
+  compactRanges();
+}
+
+let sum = 0;
+for (const range of ranges2) {
+  sum += range.end - range.start + 1;
+}
+
+console.timeEnd("part2");
+console.log(sum);
+
+// functions
+
+function compactRanges() {
+  let continuing = false;
+  let i = 0;
+  while (i < ranges2.length - 1) {
+    if (ranges2[i + 1].start <= ranges2[i].end + 1) {
+      ranges2[i].end = Math.max(ranges2[i].end, ranges2[i + 1].end);
+      ranges2.splice(i + 1, 1);
+      continuing = true;
+    } else {
+      i++;
+    }
+  }
+  processing = continuing;
+}
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