diff --git a/javascript/0523-continuous-subarray-sum.js b/javascript/0523-continuous-subarray-sum.js
new file mode 100644
index 000000000..107151223
--- /dev/null
+++ b/javascript/0523-continuous-subarray-sum.js
@@ -0,0 +1,24 @@
+/**
+ * https://leetcode.com/problems/continuous-subarray-sum/
+ * Hasing
+ * Time O(n) | Space O(n)
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {boolean}
+ */
+var checkSubarraySum = function(arr, k) {
+ let sum = 0;
+ const remainderMap = new Map([ [0, -1] ]);
+
+ for(let i = 0; i < arr.length; i++) {
+ sum += arr[i];
+ if(remainderMap.has(sum%k) && i - remainderMap.get(sum%k) > 1) {
+ return true;
+ }
+ if(!remainderMap.has(sum%k)) {
+ remainderMap.set(sum%k,i);
+ }
+ }
+
+ return false;
+ };
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