How Cursors work

A cursor is a way to read the state at some location in a data structure, and also to dispatch actions to that same location.

This is a simplified version, leaving out the piping operator:

interface Cursor<S, A> {
    readonly state: S;
    (action: A): Cursor<S, A>;
}

Two things to note:

1. A cursor doesn't have a dispatch function; it is a dispatch function.
2. It returns another cursor of the same type, so you can access the new state after your action has been dispatched. The value of state never changes on an existing cursor.

You can call snapshot, passing it your store` to get a cursor to the whole store, and then using the piping operator to get to the objects inside.