ts: replace || with ?? for default value on not-found values in sets

Author: aikhelis

typescript/Hash Maps and Sets/geometric_sequence_triplets.ts

@@ -3,21 +3,21 @@ function geometric_sequence_triplets(nums: number[], r: number): number {
     const right_map: { [key: number]: number } = {};
     let count = 0;
     // Populate 'right_map' with the frequency of each element in the array.
-    for (const x of nums) 
-        right_map[x] = (right_map[x] || 0) + 1;
+    for (const x of nums)
+        right_map[x] = (right_map[x] ?? 0) + 1;
     // Search for geometric triplets that have x as the center.
     for (const x of nums) {
-        // Decrement the frequency of x in right_map' since x is now being
+        // Decrement the frequency of x in right_map since x is now being
         // processed and is no longer to the right.
         right_map[x] -= 1;
         if (x % r === 0) {
             const left_value = x / r;
             const right_value = x * r;
-            count += (left_map[left_value] || 0) * (right_map[right_value] || 0);
+            count += (left_map[left_value] ?? 0) * (right_map[right_value] ?? 0);
         }
-        // Increment the frequency of x in leftMap since it'll be a part of the
+        // Increment the frequency of x in left_map since it'll be a part of the
         // left side of the array once we iterate to the next value of x.
-        left_map[x] = (left_map[x] || 0) + 1;
+        left_map[x] = (left_map[x] ?? 0) + 1;
     }
     return count;
 }