Effector vs redux-saga: What are the differences?

Introduction

Effector and redux-saga are both libraries that help manage side effects in JavaScript applications. While they serve a similar purpose, there are key differences between the two. In this article, we will explore these differences and understand when to choose one over the other.

1. Programming Paradigm: Effector is based on the reactive programming paradigm, where changes are propagated automatically. On the other hand, redux-saga follows the generator-based approach, allowing for declarative handling of asynchronous operations.

2. Integration with Redux ecosystem: Effector is a standalone state management library that can be used with or without Redux. It provides a built-in integration with React to handle state updates efficiently. In contrast, redux-saga is a middleware for Redux, which means it relies on Redux as the core state management tool. It enhances Redux by enabling better handling of asynchronous actions through generators.

3. Concept of actors: Effector introduces the concept of actors, which are units of state and effects. Actors can be thought of as independent units that can hold local state and perform side effects. This allows for better separation of concerns and easier testing. Redux-saga, on the other hand, does not have a concept of actors and treats side effects as separate functions.

4. Async Flow Control: Effector provides a powerful tool called effect combinators, which enables fine-grained control over the execution order of side effects. This capability makes it easier to handle complex async flow scenarios. Redux-saga, on the other hand, offers saga composition, which allows for composing multiple sagas together to handle more complex async flows.

5. Performance: Effector is known for its performance optimizations. It achieves this by minimizing re-renders and minimizing the number of store updates. Redux-saga, being a middleware, adds an extra layer of indirection and can have a slight impact on performance due to the generator-based approach.

6. Learning Curve: Effector has a steeper learning curve compared to redux-saga, especially for developers who are not familiar with reactive programming concepts. Redux-saga, on the other hand, is relatively easier to grasp as it follows a more traditional imperative style of programming.

In summary, while both Effector and redux-saga are great choices for managing side effects in JavaScript applications, they differ in the programming paradigms they follow, their integration with the Redux ecosystem, the concept of actors, async flow control capabilities, performance optimizations, and learning curve. Choosing between the two ultimately depends on the specific requirements and preferences of the project.