Implementation of Binary Search

Learn how to implement Binary Search through recursive and iterative approaches.

We'll cover the following

Binary Search implementation

There can be two ways to implement Binary Search: recursive and iterative.

We will look at the recursive approach first. In this, we basically ignore half of the elements after just one comparison.

  • Compare the key with the middle element.
  • If the key matches with the middle element, return the mid index.
  • Else if the key is greater than the mid element, then the key can only lie in the right half sub-array after the mid element. So we recur for the right half.
  • Else (key is smaller) recur for the left half.

Look at the code below:

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