Reading 29 - morgan-401-advanced-javascript/seattle-javascript-401n14 GitHub Wiki
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Combined Reducers
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The combineReducers helper function turns an object whose values are different reducing functions into a single reducing function you can pass to createStore.
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The resulting reducer calls every child reducer, and gathers their results into a single state object. The state produced by combineReducers() namespaces the states of each reducer under their keys as passed to combineReducers()