How to use Reducers effectively ( React Redux )

How to use Reducers effectively ( React Redux )

Reducers are part of Redux (which is a predictable state container for JS apps). Redux is used mostly for application state management in JS frameworks/libraries. Redux maintains the state of an entire application in a single immutable state tree (object) which cannot be changed directly. To change something, a new object must be created (using actions and reducers). In this tutorial, you'll see How to use Reducers effectively ( React Redux )

Reducers are part of Redux (which is a predictable state container for JS apps). Redux is used mostly for application state management in JS frameworks/libraries. Redux maintains the state of an entire application in a *single immutable state tree (object) *which cannot be changed directly. To change something, a new object must be created (using actions and reducers).

So what are reducers anyway?

Reducers are used in response to an action that is sent to the store (a single immutable store). Reducers specify how the application’s state changes while action only describes what happens. You can think of reducers like a state changer, Let’s take an example of simple application where you want to display a list of food dishes using React js with Redux. Now, this list will usually have 3 actions:

i) DISHES_LOADING: which indicates dishes are been loading.

ii) DISHES_FAILED: which indicates the application failed to fetch the dishes details.

iii) ADD_DISHES: This indicates adding new dishes to a list.

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Fig.1. ActionTypes.jsx file

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Fig.2. Dishes Reducer

Here you can see we don’t mutate the state, we simply create a return the new copies of the object. The default state returns the previous state.

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