Clean Code: A Handbook of Agile Software Craftsmanship (Robert C. Martin Series)

by Robert C. Martin

You should name a variable using the same care with which you name a first-born child.

Code, without tests, is not clean.

FUNCTIONS SHOULD DO ONE THING. THEY SHOULD DO IT WELL. THEY SHOULD DO IT ONLY.

We want to be able to hear a class or function name and not be surprised when we discover its responsibilities.

Care is a precious resource.