用简单的术语解释TDD

I am wondering how to do debugging. At present the steps I follow is,

• I complete a large script,
• Comment everything but the portion I want to check
• Execute the script

在其中一个答案中,另一个用户说提问者正在以错误的方式调试：

Your sequence seems entirely backwards to me. Here’s how I do it:

1. I write a test for the functionality I want.
2. I start writing the script,executing bits and verifying test results.
3. I review what I’d done to document and publish.

我对编程很新,我遵循第一种做事方式.似乎第二种方式称为测试驱动开发,它似乎是一种非常低效的做事方式.

你能用更简单的方式解释TDD及其优点吗？