Create array-wrapper.ts

Author: kamyu104

TypeScript/array-wrapper.ts

@@ -0,0 +1,18 @@
+// Time:  valueOf:  O(n)
+//        toString: O(n)
+// Space: O(1)
+
+class ArrayWrapper {
+    #arr: number[];
+    constructor(nums: number[]) {
+        this.#arr = nums;
+    }
+
+    valueOf() {
+        return this.#arr.reduce((total, x) => total+x, 0);
+    }
+
+    toString() {
+        return '[' + this.#arr.join(',') + ']';
+    }
+};