Combine Reducers - sarahduv-401-advanced-javascript/seattle-javascript-401d32 GitHub Wiki
Why use them?
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As your app grows more complex, you'll want to split your reducing function into separate functions, each managing independent parts of the state.
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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().
Example
rootReducer = combineReducers({potato: potatoReducer, tomato: tomatoReducer})
// This would produce the following state object
{
potato: {
// ... potatoes, and other state managed by the potatoReducer ...
},
tomato: {
// ... tomatoes, and other state managed by the tomatoReducer, maybe some nice sauce? ...
}
}