Structures

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A loadable object that contains loading informations

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A selector is a pure function that accepts atoms or other sync selectors as input. When these upstream atoms or sync selectors are updated, the selector function will be re-evaluated. Components can subscribe to selectors just like atoms, and will then be re-rendered when the selectors change. Selectors are used to calculate derived data that is based on state. This lets us avoid redundant state because a minimal set of state is stored in atoms, while everything else is efficiently computed as a function of that minimal state.

 let currentBooksSel = selector { accessor -> [Book] in
    let books = accessor.get(allBookStore)
      if let category = accessor.get(selectedCategoryState) {
          return books.filter { $0.category == category }
      }
    return books
}

MutableSelector is a bi-directional sync selector receives the incoming value as a parameter and can use that to propagate the changes back upstream along the data-flow graph.

 let tempFahrenheitState = atom(32)
 let tempCelsiusSelector = selector(
      get: { get in
        let fahrenheit = accessor.get(tempFahrenheitState)
        return (fahrenheit - 32) * 5 / 9
      },
      set: { context, newValue in
        let newFahrenheit = (newValue * 9) / 5 + 32
        context.accessor.set(tempFahrenheitState, newFahrenheit)
      }
)

A AsyncSelector is a pure function that other async selectors as input. those selector be impletemented by Combine or async/await Selector and AsyncSelector can not allow you pass a user-defined argument, if you want to pass a customable parameters. please refer to selectorFamily

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