diff --git a/2399.check-distances-between-same-letters.js b/2399.check-distances-between-same-letters.js
new file mode 100644
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+++ b/2399.check-distances-between-same-letters.js
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+/* URL of this problem
+ * https://leetcode.com/problems/check-distances-between-same-letters/description/
+ *
+ * @param {string} s
+ * @param {number[]} distance
+ * @return {boolean}
+ */
+
+var checkDistances = function(s, distance) {
+    for (let i = 0; i < distance.length; i++) {
+        // The range of Lowercase English letters on the UTF-16 code table are from 97 to 122.
+        // Get a matching English letter by adding each index of distance, staring from 0, and 97
+        const Char = String.fromCharCode(97 + i);
+        const ElementCount = CountElementInbetween(s, Char);
+
+        if (!s.includes(Char)) {
+            continue;
+        }
+
+        if (distance[i] !== ElementCount) {
+            return false;
+        }
+    }
+    return true;
+};
+
+const CountElementInbetween = (str, char) => {
+    const Chars = [...str];
+    const CharIndexes = [];
+    
+    Chars.forEach((element, idx) => {
+        if (element === char) {
+            CharIndexes.push(idx);
+        }
+    });
+
+    // Count the number of elements in between char
+    return Math.abs(CharIndexes[0] - CharIndexes[1]) - 1;
+}
+
+module.exports = checkDistances;
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diff --git a/checkDistances.test.js b/checkDistances.test.js
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+++ b/checkDistances.test.js
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+const checkDistances = require("./2399.check-distances-between-same-letters");
+
+test("Return true if the input s is a well-spaced string", () => {
+    expect(checkDistances("abaccb", [1,3,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0])).toBeTruthy();
+});
+
+test("Return false if the input s is NOT a well-spaced string", () => {
+    expect(checkDistances("aa", [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0])).toBeFalsy();
+});
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