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11. Don’t Modify Objects You Don’t Own > The Rules
The Rules
Enterprise software needs a consistent and dependable execution environment to be maintainable. In other languages, you consider existing objects as libraries for you to use to complete your task. In JavaScript, you might see existing objects as a playground in which you can do anything you want. You should treat the existing JavaScript objects as you would a library of utilities:
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Don’t override methods.
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Don’t add new methods.
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Don’t remove existing methods.
When you’re the only one working on a project, it’s easy to get away with these types of modification because you know them and expect them. When working with a team on a large project, making changes like this causes mass confusion and a lot of lost time.