Finished

Test Name	Status
empty	Pass
no nesting	Pass
flattens a nested array	Pass
flattens array with just integers present	Pass
5 level nesting	Pass
6 level nesting	Pass
undefined values are omitted from the final result	Pass
null values are omitted from the final result	Pass
consecutive null values at the front of the array are omitted from the final result	Pass
consecutive null values in the middle of the array are omitted from the final result	Pass
6 level nested array with null values	Pass
all values in nested array are null	Pass

 //
 /**
+ * @param {any[]} arr
+ * @returns {any[]}
+ * Flattens a nested array of any depth, excluding null and undefined values.
+ *
+ * @param {any[]} arr - The nested array to flatten
+ * @returns {any[]} - A flattened array with all null and undefined values removed
+ *
+ * Edge Cases Handled:
+ * - Empty arrays
+ * - Arrays with only null/undefined values
+ * - Deeply nested arrays
+ * - Mixed data types
+ * - Non-array inputs (returns empty array)
  */
 export const flatten = (arr) => {
+  throw new Error('Remove this line and implement the function');
+  // Edge Case: Input is not an array
+  if (!Array.isArray(arr)) {
+    return [];
+  }
+  const result = [];
+  for (const item of arr) {
+    // Edge Case: Skip null and undefined values
+    if (item === null || item === undefined) {
+      continue;
+    }
+    // Edge Case: Handle nested arrays
+    if (Array.isArray(item)) {
+      result.push(...flatten(item));
+    } else {
+      result.push(item);
+    }
+  }
+  return result;
+  // Handled Edge Cases: Input is not an array, Empty arrays, Arrays with only null/undefined values, Deeply nested arrays, Mixed data types, Non-array inputs
 };

let it go