diff --git a/javascript/4-Median-Of-Two-Sorted-Arrays.js b/javascript/4-Median-Of-Two-Sorted-Arrays.js
new file mode 100644
index 000000000..1f364ac01
--- /dev/null
+++ b/javascript/4-Median-Of-Two-Sorted-Arrays.js
@@ -0,0 +1,36 @@
+/**
+ * @param {number[]} nums1
+ * @param {number[]} nums2
+ * @return {number}
+ */
+var findMedianSortedArrays = function(nums1, nums2) {
+ let [A, B] = [nums1, nums2]
+ const total = nums1.length + nums2.length
+ const half = Math.floor(total / 2)
+
+ if (B.length < A.length) {
+ [A, B] = [B, A]
+ }
+
+ let [l, r] = [0, A.length -1]
+ while (true) {
+ const i = (l + r)
+ const j = half - i - 2
+
+ const Aleft = i >= 0 ? A[i] : -Infinity
+ const Aright = (i + 1) < A.length ? A[i + 1] : Infinity
+ const Bleft = j >= 0 ? B[j] : -Infinity
+ const Bright = (j + 1) < B.length ? B[j + 1] : Infinity
+
+ if (Aleft <= Bright && Bleft <= Aright) {
+ if (total % 2) {
+ return Math.min(Aright, Bright)
+ }
+
+ return (Math.max(Aleft, Bleft) + Math.min(Aright, Bright)) / 2
+ }
+ else if (Aleft > Bright) r = i - 1
+ else l = i + 1
+ }
+};
+
diff --git a/javascript/981-Time-Based-Key-Value-Store.js b/javascript/981-Time-Based-Key-Value-Store.js
new file mode 100644
index 000000000..2c19d7648
--- /dev/null
+++ b/javascript/981-Time-Based-Key-Value-Store.js
@@ -0,0 +1,44 @@
+var TimeMap = function() {
+ this.keyStore = {}
+};
+
+/**
+ * @param {string} key
+ * @param {string} value
+ * @param {number} timestamp
+ * @return {void}
+ */
+TimeMap.prototype.set = function(key, value, timestamp) {
+ if (!this.keyStore[key]) this.keyStore[key] = []
+ this.keyStore[key].push([value, timestamp])
+};
+
+/**
+ * @param {string} key
+ * @param {number} timestamp
+ * @return {string}
+ */
+TimeMap.prototype.get = function(key, timestamp) {
+ let res = ""
+ const values = this.keyStore[key] || []
+ let l = 0, r = values.length -1
+
+ while (l <= r) {
+ const m = Math.floor((l + r) / 2)
+ if (values[m][1] <= timestamp) {
+ res = values[m][0]
+ l = m + 1
+ }
+ else r = m - 1
+ }
+
+ return res
+};
+
+/**
+ * Your TimeMap object will be instantiated and called as such:
+ * var obj = new TimeMap()
+ * obj.set(key,value,timestamp)
+ * var param_2 = obj.get(key,timestamp)
+ */
+
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