freeCodeCamp/guide/spanish/certifications/javascript-algorithms-and-data-structures/basic-javascript/decrement-a-number-with-javascript/index.md

---
title: Decrement a Number with JavaScript
localeTitle: Disminuir un número con JavaScript
---
## Disminuir un número con JavaScript

Disminuye un número usando el operador '-':
```
var a = 5; 
 a--; // Now, 'a' is 4 
 --a; // Now, 'a' is 3 

```