Principles catalog

Principles are general ideas. They explain why you do things a certain way, that is, they explain patterns. Take the sewing and woodworking pattern "measure twice, cut once." Why do that? Because of the principle "materials are expensive, and shouldn't be wasted." (OK, that's a pretty obvious principle.)

Here are principles on this website.

Title Summary Tags Where referenced

Break a task into smaller tasks, do each smaller task, and put them back together.

Pattern Sales report, Multiway
Incremental testing

Write a little code, then test it. Write a little more code, then test it.

Debugging Avoiding bugs, Sales report
Read code actively

When code doesn't work, the first thing to do is carefully read through the code.

Debugging Debugging
Working backwards

Start by understanding a program's goal, then work backwards.

Sales report