ShopViewModel.swift

ShopViewModel.swift

// Classic 

class ShopViewModel: ObservableObject {
    @Published private(set) var products: [Products]
    init(products: [Products] = []) {
        self.products = products
    }
    public func add(product) {
        products.append(product)
    }
    public func remove(product) {
        products.removeAll { $0 == product }
    } 
}

// State / Reducer 

struct ShopState: Equatable {
    var products: [String] = []
}

enum ShopAction: Equatable {
    case add(String)
    case remove(String)
}

let reduce: (ShopState, ShopAction) -> ShopState = { state, action in
    var newState = state
    
    switch action {
    case let .add(product):
        newState.products.append(product)
    case let .remove(product):
        newState.products.removeAll { $0 == product }
    }
    
    return newState
}

typealias ShopStore = Store<ShopState, ShopAction>