BlockReducer

public final class BlockReducer<StateType>: Reducer

Create a reducer inline with a block

Example

Create a reducer without defining a class/struct that implements Reducer

let myReducer = BlockReducer(state: 1) { state, action in
  guard let newState = state as? Int else { return state }

  // cast the action to a specific type
  if action is SomeAction {
    return newState + 1
  }

  return newState
}

Note: Returning nil from BlockReducer signifies that the state did not change which will not inform the listeners

initialState
Inital state value for this particular reducer This initial state will be used to populate the Store state (which represents the app state)
Declaration
Swift

public let initialState: StateType
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stateKey
(Optional) The state key for this reducer. If not implemented (or set) the type of initialState will be used as a key.

It is recommended to not set the stateKey as it will use the type name of the initialState instead.
Declaration
Swift

public let stateKey: String
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                    init(initialState:reduce:)

Create a reducer with a state and a reduce function

Declaration

Swift

public convenience init(initialState: StateType, reduce: @escaping ReducerFunction<StateType>)

Parameters

`state`	the initial state of the reducer. This initial state will be used to populate the Store state (which represents the app state)
`reduce`	the reduce function. A block that receives the current state and dispatched action and return a new state (or nil if the action did not change the state)

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                    init(initialState:stateKey:reduce:)

Create a reducer with a state, a state key, and a reduce function

Declaration

Swift

public init(initialState: StateType, stateKey: StateKey, reduce: @escaping ReducerFunction<StateType>)

Parameters

`initialState`	the initial state of the reducer. This initial state will be used to populate the Store state (which represents the app state)
`stateKey`	The state key for this reducer. If not implemented (or set) the type of `initialState` will be used as a key.
`reduce`	the reduce function. A block that receives the current state and dispatched action and return a new state (or nil if the action did not change the state)

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                    reduce(state:action:)

Declaration

Swift

public func reduce(state: StateType, action: Action) -> StateType?

Parameters

`state`
`action`

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