Storing long-term data: Since data stored in redux persists until page refresh, it is widely used to store long-term data that is required while the user navigates the application, such as, data loaded from an API, data submitted through a form, etc. However, the old object is returned if there are no changes (no re-rendering).Ĥ. In case of any data changes, a new object is returned from the reducer (re-rendering takes place). It takes a given state (object) and passes it to each reducer in a loop.
As opposed to React, Redux depends on such pure functions. Pure reducer functions: A pure function is defined as any function that doesn’t alter input data, doesn’t depend on the external state, and can consistently provide the same output for the same input. Redux store helps in improving the performance by skipping such unnecessary re-renders and ensuring that a given component re-renders only when its data has actually changed.ģ. In such a case when the data for a given component hasn’t changed, these re-renders are wasted (cause the UI output displayed on the screen would remain the same). Performance Optimizations: By default, whenever a component is updated, React re-renders all the components inside that part of the component tree.
So while developing large, complex applications with many components, the Redux store is highly preferred.Ģ. This centralizes all data and makes it very easy for a component to get the state it requires. All the components of the entire application can easily access the data directly. Redux state, on the other hand, is stored globally in the store. To share this state with other components in the application, props are passed to child components, or callbacks are used for parent components. Store: React state is stored locally within a component.
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