diff --git a/typescript/1299-Replace-Elements-With-Greatest-Element-On-Right-Side.ts b/typescript/1299-Replace-Elements-With-Greatest-Element-On-Right-Side.ts
new file mode 100644
index 000000000..6916a1834
--- /dev/null
+++ b/typescript/1299-Replace-Elements-With-Greatest-Element-On-Right-Side.ts
@@ -0,0 +1,12 @@
+function replaceElements(arr: number[]): number[] {
+    let currMax = -1;
+    
+    for(let i = arr.length -1 ; i >= 0; i--) {
+        let newMax = Math.max(currMax, arr[i]);         
+        arr[i] = currMax;
+        
+        currMax = newMax;
+    }
+    
+    return arr;
+};