Lifting State Up in ReactJS is a design pattern used to manage state in an application with multiple components that rely on the same data. In React, each component can have its own state, but this can lead to issues such as data redundancy and inconsistency when multiple components need to reflect the same changing data.
When you "lift state up," you move the state management to the nearest common ancestor of the components that need access to the state. This common ancestor component becomes the "single source of truth" for the state data. It holds the state, and any child components that need to read or update the state do so through props and callback functions provided by the ancestor.
This pattern ensures that the state is consistent across all components that depend on it. It also simplifies the data flow in the application, as state is passed down from the parent through props, and actions that modify the state are communicated up through callbacks.
For example, if you have two sibling components that both need to display and update the same piece of data, you would lift the state up to their parent component. The parent would manage the state and pass it down to the siblings as props. If one sibling needs to update the state, it would call a function passed down from the parent, which would update the parent's state, and the new state would then be passed down to both siblings, keeping them in sync[1][2][3][4][5][6][11].
Lifting state up is particularly useful in scenarios where local state would otherwise ...
