In the real world, most people don't do TDD at work. In my opinion it's a good tool in some cases, for simple algorithms or when you know exactly what you want

In the real world, most people don't do TDD at work. In my opinion it's a good tool in some cases, for simple algorithms or when you know exactly what you want. But most of the time it's too cumbersome or totally not practical. So you should not force yourself to do TDD for the sake of it. That's also why you only find toys examples, where TDD is a good idea for them.