diff --git a/2264.largest-3-same-digit-number-in-string.js b/2264.largest-3-same-digit-number-in-string.js
new file mode 100644
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--- /dev/null
+++ b/2264.largest-3-same-digit-number-in-string.js
@@ -0,0 +1,26 @@
+/* URL of this problem
+ * https://leetcode.com/problems/largest-3-same-digit-number-in-string/description/
+ *
+ * @param {string} num
+ * @return {string}
+ */
+
+var largestGoodInteger = function(num) {
+    const ThreeSameDigitNums = [];
+    let maxGoodInt = -Infinity;
+
+    for (let i = 0; i < num.length - 2; i++) {
+        if (num.charAt(i) === num.charAt(i + 1) && num.charAt(i) === num.charAt(i + 2)) {
+            ThreeSameDigitNums.push(num.substring(i, i + 3));
+        }
+    }
+    ThreeSameDigitNums.forEach(num => {
+        if (maxGoodInt < num) {
+            maxGoodInt = num;
+        }
+    })
+
+    return maxGoodInt >= 0 ? maxGoodInt : "";
+};
+
+module.exports = largestGoodInteger;
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diff --git a/largestGoodInteger.test.js b/largestGoodInteger.test.js
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--- /dev/null
+++ b/largestGoodInteger.test.js
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+const largestGoodInteger = require("../jest-test/2264.largest-3-same-digit-number-in-string");
+
+test("Return the maximum good integer from num with multiple good integers", () => {
+    expect(largestGoodInteger("6777133339")).toBe("777");
+});
+
+test("Return 000 if it is the only good integer", () => {
+    expect(largestGoodInteger("2300019")).toBe("000");
+});
+
+test("Return an empty string if num has only two elements", () => {
+    expect(largestGoodInteger("42")).toBe("");
+});
+
+test("Return an empty string if num has only one elements", () => {
+    expect(largestGoodInteger("4")).toBe("");
+});
+
+test("Return an empty string if num has no elements", () => {
+    expect(largestGoodInteger("")).toBe("");
+});
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