> For the complete documentation index, see [llms.txt](https://javascript-1.gitbook.io/design-pattern/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://javascript-1.gitbook.io/design-pattern/anti-pattern.md).

# Anti-pattern

If a design pattern represents good practice, then an anti-pattern represents bad practice. An example of an anti-pattern would be modifying the Object class prototype. Changes to the Object prototype can be seen in all of the objects that inherit from this prototype (that is, almost all objects in JavaScript).