example reduce

example reduce.swift

func reduce(_ action: Action, for currentState: State) -> State {
    switch action {
     // from User
     case .typeQuery(let query):
        let newState = currentState.mutate { $0.query = query } 
	sideEffects.accept(.requestAutoCompletions(for: query))
        return newState
        
    case .tapSearchButton:
        let newState = currentState.mutate { $0.onProgress = true }
	sideEffects.accept(.requestSearchResults(for: query))
        return newState
        
    // from Side Effect
    case .fetchAutoCompletion(let autoCompletions):
        let newState = currentState.mutate { $0.autoCompletions = autoCompletions }
        return newState
        
    case .fetchSearchResult(let searchResults):
        let newState = currentState
            .mutate({
                $0.searchResults = searchResults
                $0.onProgress = false
            })
        return newState
    }
}