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JavaScript Building Applications with React and Redux Actions, Dispatch, and Reducers. Oh my! Intro to Reducers

(action.types) as the parameter value for the Player function...

How are we using that ? should it just not be (action) ?

Actually, action.types is the value being evaluated in the switch statement. The value being passed as the second argument of the player function is, as you said it should be, the action object. The type property on the action object is going to be one of the action type strings we defined in src/actiontypes/player.js. So, just for clarity, you should be looking at something like this as the first couple of lines of the Player reducer:

export default function Player(state=initialState, action) {
  switch(action.type) {

I hope that helps.