Immutability Model
- immer:
immeruses a proxy-based approach to allow mutable-like updates while keeping the original state immutable. This means you can write code that looks like it modifies the state directly, butimmertracks the changes and produces a new immutable state object. - immutability-helper:
immutability-helperprovides a declarative way to update nested immutable data using a simple syntax. It allows you to specify the changes you want to make at any level of the object, and it handles creating the new immutable structure for you. - seamless-immutable:
seamless-immutablecreates deeply immutable objects and arrays by recursively freezing the data. Once an object is made seamless-immutable, it cannot be changed, ensuring that all levels of the structure are protected from mutations.
Ease of Use
- immer:
immeris easy to use, especially for developers who are familiar with mutable programming. Its API allows for intuitive state updates without needing to understand the complexities of immutability. - immutability-helper:
immutability-helperhas a simple and straightforward API that makes it easy to update nested data structures. Its declarative nature helps keep the code clean and understandable. - seamless-immutable:
seamless-immutableis very easy to use for creating immutable data. However, since it does not provide any tools for updating the data, developers need to be mindful of how they handle state changes.
Performance
- immer:
immeris efficient for most use cases, but its proxy-based approach can introduce some overhead, especially for very large objects or frequent updates. However, the trade-off is often worth it for the clarity it brings to state management. - immutability-helper:
immutability-helperis lightweight and performs well for updating nested data structures. It is designed to be efficient, but performance can vary depending on the complexity of the updates being made. - seamless-immutable:
seamless-immutableis very fast for creating immutable objects, but since it creates a new copy of the data structure for every update, it is important to use it judiciously in performance-sensitive applications.
Mutability Control
- immer:
immerallows for controlled mutability within theproducefunction, giving developers the flexibility to write code that feels mutable while maintaining immutability at the data structure level. - immutability-helper:
immutability-helperdoes not allow mutability; it enforces immutability by creating new copies of the data structure based on the specified changes. - seamless-immutable:
seamless-immutableenforces strict immutability by making the entire object and its properties read-only, preventing any form of mutation.
Code Example
- immer:
Example of using
immerfor state updates:import produce from 'immer'; const initialState = { count: 0, user: { name: 'Alice' } }; const nextState = produce(initialState, draft => { draft.count += 1; // Mutating the draft draft.user.name = 'Bob'; // Mutating nested property }); console.log(nextState); // { count: 1, user: { name: 'Bob' } } console.log(initialState); // { count: 0, user: { name: 'Alice' } } - immutability-helper:
Example of using
immutability-helperfor nested updates:import update from 'immutability-helper'; const initialState = { count: 0, user: { name: 'Alice', age: 25 } }; const nextState = update(initialState, { count: { $set: initialState.count + 1 }, // Update count user: { name: { $set: 'Bob' }, age: { $set: 26 } }, // Update nested properties }); console.log(nextState); // { count: 1, user: { name: 'Bob', age: 26 } } console.log(initialState); // { count: 0, user: { name: 'Alice', age: 25 } } - seamless-immutable:
Example of creating immutable objects with
seamless-immutable:import seamless from 'seamless-immutable'; const immutableObj = seamless({ name: 'Alice', age: 25 }); const immutableArr = seamless([1, 2, 3]); console.log(immutableObj.name); // Alice console.log(immutableArr[0]); // 1 // Attempting to mutate will fail silently (in strict mode) or throw an error immutableObj.name = 'Bob'; // No error, but the change is ignored immutableArr[0] = 10; // No error, but the change is ignored console.log(immutableObj.name); // Alice console.log(immutableArr[0]); // 1
