---
title: hammingDistance
tags: math,algorithm,intermediate
---

Calculates the Hamming distance between two values.

- Use the XOR operator (`^`) to find the bit difference between the two numbers.
- Convert to a binary string using `Number.prototype.toString(2)`.
- Count and return the number of `1`s in the string, using `String.prototype.match(/1/g)`.

```js
const hammingDistance = (num1, num2) =>
  ((num1 ^ num2).toString(2).match(/1/g) || '').length;
```

```js
hammingDistance(2, 3); // 1
```