Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Computer Science Introduction to Algorithms Algorithms in Code Recursive Binary Search

Gabbie Metheny
Gabbie Metheny
33,778 Points

SOLUTION: JavaScript recursive binary search

I noticed in the notes following this video, there's a binary_search function for those following along in JavaScript, but no recursive_binary_search. Wanted to provide mine, just in case it helps anyone! And if you're a JS dev struggling with recursion, here's my favorite video on the subject, courtesy of Fun Fun Function :)

function recursive_binary_search(list, target) {
  if (list.length === 0) {
    return false;
  } else {
    let midpoint = Math.floor(list.length / 2);

    if (list[midpoint] === target) {
      return true;
    } else {
      if (list[midpoint] < target) {
        return recursive_binary_search(list.slice(midpoint + 1), target);
      } else if (list[midpoint] > target) {
        return recursive_binary_search(list.slice(0, midpoint), target);

6 Answers

Nice! :+1: