reduxjs/reselect
Reselect
Reselect is a state management optimization tool and memoization utility designed to minimize redundant calculations and UI re-renders. It functions as a library for creating memoized selectors that derive specific data from a state store.
The library implements input-based memoization and recursive selector composition to create a hierarchy of derived data dependencies. It ensures reference-stable result caching and provides custom equality checking to determine when a cache should be invalidated.
The project covers capabilities for derived data computation, frontend performance optimization, and selector stability validation to identify unstable behavior during development.
Features
- Memoization Caches - Caches function results and returns them if input arguments remain identical to previous calls.
- Reference-Stable Caches - Ensures the same object reference is returned when output has not changed to prevent unnecessary downstream re-renders.
- Composable Selector Pipelines - Implements chains of memoized selectors where downstream computations execute only when upstream dependencies change.
- Memoization Utilities - A utility that caches expensive computation results based on inputs to optimize component lifecycles.
- Redux Implementations - Optimizes the retrieval of data from a centralized immutable store to prevent redundant calculations.
- State Selectors - Provides a framework for creating stable and efficient functions to extract and format state slices.
- Derived State - Calculates new values from raw state and caches them until the underlying input data changes.
- State Selectors - Provides a library for creating memoized selectors that derive specific data from a global state store.
- Recursive Compositions - Allows selectors to be nested and chained together to manage complex derived data dependencies.
- Memoized Derivations - Caches computed results and triggers recalculations only when reactive input values change.
- Custom Memoization Rules - Allows developers to define custom equality functions to control when memoized values are invalidated.
- Value-Based Equality Checking - Provides mechanisms to invalidate caches using structural value comparison instead of simple reference checks.
- Frontend Performance Optimization - Reduces the frequency of expensive data transformations and UI updates through strategic memoization.
- State Optimization Tools - Reduces redundant calculations in application state by tracking dependencies and invalidating caches only when needed.
