ViewModel protocol

ViewModel.swift

import Foundation

/// This protocol defines basic responsibility for `ViewModel`
protocol ViewModel {
    /// This method is called when `ViewModel` updates itself with `new` data
    var didUpdate: (() -> Void)? { get set }
    
    /// This method is called when `ViewModel` changes its state
    /// - isLoading: Loading state of ViewModel
    /// - loadingMessage: Loading messages to display while ViewModel is loading
    var didChangeState: ((_ isLoading: Bool, _ loadingMessage: String?) -> Void)? { get set }
}

protocol Searchable {
    func searchFor(keyword: String)
}