'State Management in SolidJS Applications' solidjs frontend
It's important to note that signals are the units of change. When you update a certain part of a signal's data, all of its subscribers are notified no matter if they use that particular part or not. Let's demonstrate this behavior with a contrived example:
In this example, we have a signal that is used by two effects: one renders and updates the UI, while the other prints the last name to the console. The second effect doesn't use the first name, but whenever the first name changes, it still reruns unnecessarily. To avoid unnecessary computations, we could use one signal for the first name and another signal for the last name. In more complex cases, we could nest signals, for example, having a signal to contain a list whose items being signals as well. It works, but the code would be rather cumbersome. Fortunately, Solid has a built-in solution for nested reactivity: stores.Let's use a store to replace the signal in the previous example.
How does a store work? A store is a proxy object whose properties are automatically wrapped in proxies themselves. Behind the scenes, Solid lazily creates signals for properties that are accessed under tracking scopes. So basically, a store is a tree of signals that are independently tracked and modified.
As you probably have noticed from the example, the syntax for reading and writing data with stores is different from that with signals. To read data you don't need a getter function but can simply access properties as you would do with normal objects. To write data, you can use Solid store's path syntax. Below are some examples of the path syntax copied from Solid's documentation:
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