diff --git a/javascript/1422-maximum-score-after-splitting-a-string.js b/javascript/1422-maximum-score-after-splitting-a-string.js
new file mode 100644
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+++ b/javascript/1422-maximum-score-after-splitting-a-string.js
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+/**
+ * Array | Counting
+ * Time O(n) | Space O(n) (because  we're making array when counting ones' freq)
+ * https://leetcode.com/problems/maximum-score-after-splitting-a-string
+ * @param {string} s
+ * @return {number}
+ */
+var maxScore = function(s) {
+    
+    let zeroCount = 0;
+    let oneCount = s.split("").filter((c) => c === "1").length;
+
+    let maxSum = 0;
+    for (let i = 0; i < s.length - 1; i++) {
+        if (s[i] === "0") zeroCount++;;
+        if (s[i] === "1") oneCount--;
+        maxSum = Math.max(maxSum, zeroCount+oneCount);
+    }
+
+    return maxSum;
+};