JavaScript: Why does my function return undefined when processing a large multidimensional array?
I've tried everything I can think of but I'm working on a project and hit a roadblock... I'm working on a personal project and I'm working on a project where I need to process a large multidimensional array in JavaScript, and I'm working with an unexpected behavior. My function is supposed to flatten the array and calculate the sum of all elements, but when I input a large dataset, it returns `undefined` instead of the expected sum. Here's the code I'm using: ```javascript function flattenAndSum(arr) { let flattenedArray = []; for (let i = 0; i < arr.length; i++) { if (Array.isArray(arr[i])) { flattenedArray = flattenedArray.concat(flattenAndSum(arr[i])); } else { flattenedArray.push(arr[i]); } } return flattenedArray.reduce((acc, val) => acc + val, 0); } const largeArray = [[1, 2, [3, 4]], [5, 6, [7, [8, 9]]]]; const result = flattenAndSum(largeArray); console.log(result); ``` I expect `result` to be `45`, but it returns `undefined`. I've tried adding `console.log` statements to see the values during each recursive call, and I can confirm that the `flattenedArray` is indeed created correctly, but somehow the final return value loses its context. I also wondered if there’s a performance consideration here since the array can get quite deep, potentially leading to a stack overflow. I'm using Node.js version 14.x. Any insights on what might be going wrong or how to handle large arrays more effectively would be appreciated! This is part of a larger application I'm building. This is part of a larger API I'm building. Is there a better approach? I'm using Javascript LTS in this project. Any advice would be much appreciated.