Skip to Content
Tutorials

Programming

Programming tutorials for people who want code that actually runs, not code that only looks right. Pick a language, start at the beginning, and don't skip the basics. They are where most problems come from.

Any category Programming4 Python 1 JavaScript 1 TypeScript 2
Any topics APIs and Integrations 5 Automation and Scripting 3 Data Structures and Algorithms 4 Databases 11 Object-Oriented Programming 4 Packaging and Dependencies 9 Performance Optimization 2 Programming Basics 2 Programming Patterns 2 Testing and Debugging 11 Type Systems 11 Web Development 12
Any level Beginner 2 Intermediate 4 Advanced 2
Programming Data Structures and Algorithms Intermediate Clear filters 4 results
0 likes
Python Dictionary Comprehensions: When They Help and When They Hurt

A dictionary comprehension builds a dictionary in one line. Good for transforming, filtering and building lookups. Bad for nested logic, side effects and anything that needs error handling. Shorter code is not always better code.

5 min read
0 likes
map, filter, reduce on a Real List of Orders

Five questions a manager would ask about a list of orders, each answered with map, filter, reduce or a plain loop. Real data includes an empty order, and the code has to survive it.

4 min read
0 likes
Write a Generic identity and map Without Losing Types

Turn two any-typed helpers into generic functions and see what the compiler now catches. After this, a typo or a wrong method on the result is a compile error.

4 min read
0 likes
Record Keys That Match a Real Enum

Key a lookup table by an enum or a union of literals so a missing or misspelled key is a compile error. After this, adding a status shows you every table that needs an entry.

3 min read