Programming

Try it Yourself 1 Track 6 Concepts 1 hr 2 min of learning

CodePLU Goal

Upgrading Human Mental Models

Learn how to think in Workflows

Programming Workflow Preview

See how a bug gets fixed step by step

Programming is easier to understand when you can trace the workflow from a failing case to debugging and then to a verified fix.

Drag nodes and connect the flow to understand the concept
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.

Tracks In This Category

Standalone Concepts

Self-contained concepts in this category. Each one stands on its own — start wherever you like.

Understand, Plan, Write, Test — Then Fix
Beginner 10 min

How Do Programmers Solve Problems?

Beginners think programmers write code that works. They don't. They write code that fails, then loop through testing and fixing until it works — and that loop is the real skill.

A Box With a Promise, Checked by Hand
Beginner 12 min

What Is a Function, and How Do You Dry Run It?

A function is a box with a promise: give it these inputs, get that output. Learn to design one and then dry run it — tracing every value by hand before you ever press run.

You Are Describing Meaning, Not Appearance
Beginner 10 min

What Is HTML?

HTML is not about how a page looks — it is how you tell the browser what each piece of content actually is. Get that distinction and everything about web pages makes more sense.