Like a spreadsheet formula, changing one number automatically updates every related total instantly across the entire page.

The Spreadsheet Analogy

This is the app's 'memory' where it saves specific pieces of information, like a user's name or a game score.

The Central Store

Signals are like special boxes that hold a value and 'shout' to the rest of the app whenever that value is changed.

The system automatically watches which parts of your app are using which data, so you don't have to manually connect them.

These are values that update themselves by doing math or logic based on other existing pieces of information.

Instead of refreshing the whole screen, the system only changes the tiny word or number that actually moved.

You can set up specific actions, like saving a draft or showing a pop-up, to happen the moment data changes.

The app is efficient and waits until a value is actually needed before it bothers to calculate the result.

Signals create a straight line from a piece of information to the exact spot on the screen where it is displayed.

This ensures the text shown on your screen always matches the underlying data, with no risk of displaying old info.

This covers the specific tools used to tell the app that a piece of information, like a checkbox, has been clicked.

The app keeps a hidden map of how all data points relate to each other to ensure updates follow the right path.