# Errata: Data Structures and Algorithms Book!

**URL:** https://forum.kirupa.com/t/errata-data-structures-and-algorithms-book/663668
**Category:** programming
**Created:** [December 15, 2023, 3:54am UTC](https://forum.kirupa.com/t/errata-data-structures-and-algorithms-book/663668 "2023-12-15T03:54:20Z")
**Posts on this page:** 1
**Showing post:** 4

<div class="post-metadata">

### Author: ![kirupa](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/kirupa/32/11616_2.png) [@kirupa](https://forum.kirupa.com/u/kirupa)
#### Post date: [December 16, 2023, 2:55am UTC](https://forum.kirupa.com/t/errata-data-structures-and-algorithms-book/663668/4 "2023-12-16T02:55:57Z")

</div>

**Recursive Binary Search Code is Missing Return Statements**  
The correct version is here:

```js
// Recursive Approach
function binarySearch(arr, val, start = 0, end = arr.length - 1) {
  const middleIndex = Math.floor((start + end) / 2);

  if (val === arr[middleIndex]) {
    return middleIndex;
  }

  if (start >= end) {
    return -1;
  }

  if (val < arr[middleIndex]) {
    return binarySearch(arr, val, start, middleIndex - 1);
  } else {
    return binarySearch(arr, val, middleIndex + 1, end);
  }
}

```

Thanks to @transbot for noticing it and [suggesting the changes](http://forum.kirupa.com/t/found-a-bug-in-absolute-beginner-s-guide-to-algorithms/663637)!

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