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MobX vs RxJS: What are the differences?


MobX and RxJS are both popular libraries used in JavaScript for managing the state of an application. While they have some similarities, there are key differences between the two in terms of their core principles and functionalities. In this Markdown code, we will discuss six main differences between MobX and RxJS.

  1. Reactive Data Flow: MobX provides reactive data flow where changes in the state are observed and automatically propagated to the dependent parts of the application. On the other hand, RxJS is based on streams and provides a declarative way of handling asynchronous data streams, allowing for powerful data manipulation and composition.

  2. Imperative vs Declarative Programming: MobX follows an imperative programming style, where developers define how the state should change based on observed events. Conversely, RxJS follows a declarative programming style, allowing developers to define the desired end state and letting the library handle how to achieve it, abstracting away the underlying implementation details.

  3. Mutable State vs Immutable State: MobX operates on mutable state, where objects and arrays can be changed directly. It uses observable objects to track changes and automatically update the application. In contrast, RxJS prefers immutable state, focusing on the creation of new data streams through transformations and filters, making it easier to reason about the state.

  4. React Integration: MobX has seamless integration with React, making it easy to manage and update the state of React components. It provides a simple approach to define reactive components, where only necessary parts of the UI are updated when relevant data changes. On the other hand, RxJS can also be integrated with React but requires more manual handling and setup to enable reactive behavior.

  5. Granularity of Control: MobX provides fine-grained control over which parts of the application should be observed for changes. This allows developers to optimize performance by only updating relevant components. RxJS, on the other hand, provides more coarse-grained control as changes in the data streams can potentially affect multiple parts of the application.

  6. Learning Curve: MobX has a relatively shallow learning curve, especially for developers already familiar with object-oriented programming and React. It provides a simple and intuitive API to manage state. In contrast, RxJS has a steeper learning curve due to its functional approach and the need to understand concepts such as observables, operators, and subscriptions.

In summary, while both MobX and RxJS provide solutions for managing state in JavaScript applications, MobX offers reactive data flow, follows an imperative programming style, operates on mutable state, has seamless React integration, provides fine-grained control, and has a relatively shallow learning curve. In contrast, RxJS focuses on streams, follows a declarative programming style, prefers immutable state, requires additional setup for React integration, provides more coarse-grained control, and has a steeper learning curve.

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Pros of MobX
Pros of RxJS
  • 26
    It's just stupidly simple, yet so magical
  • 18
    Easier and cleaner than Redux
  • 15
  • 13
    Automagic updates
  • 13
    React integration
  • 10
    Computed properties
  • 8
    ES6 observers and obversables
  • 7
    Global stores
  • 3
    Flexible architecture the requeriment
  • 1
    Has own router package (mobx-router)
  • 6
    Easier async data chaining and combining
  • 3
    Steep learning curve, but offers predictable operations
  • 2
    Observable subjects
  • 2
    Ability to build your own stream
  • 2
    Works great with any state management implementation
  • 2
    Easier testing
  • 1
    Lot of build-in operators
  • 1
    Simplifies state management
  • 1
    Great for push based architecture
  • 1

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Cons of MobX
Cons of RxJS
  • 1
  • 3
    Steep learning curve

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What is MobX?

MobX is a battle tested library that makes state management simple and scalable by transparently applying functional reactive programming (TFRP). React and MobX together are a powerful combination. React renders the application state by providing mechanisms to translate it into a tree of renderable components. MobX provides the mechanism to store and update the application state that React then uses.

What is RxJS?

RxJS is a library for reactive programming using Observables, to make it easier to compose asynchronous or callback-based code. This project is a rewrite of Reactive-Extensions/RxJS with better performance, better modularity, better debuggable call stacks, while staying mostly backwards compatible, with some breaking changes that reduce the API surface.

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What companies use MobX?
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What are some alternatives to MobX and RxJS?
Relay Framework
Never again communicate with your data store using an imperative API. Simply declare your data requirements using GraphQL and let Relay figure out how and when to fetch your data.
It is a JavaScript library that helps you to create rich, responsive display and editor user interfaces with a clean underlying data model. Any time you have sections of UI that update dynamically (e.g., changing depending on the user’s actions or when an external data source changes), it can help you implement it more simply and maintainably.
GraphQL Cache
A custom middleware for graphql-ruby that handles key construction and cache reads/writes transparently.
Flux is the application architecture that Facebook uses for building client-side web applications. It complements React's composable view components by utilizing a unidirectional data flow. It's more of a pattern rather than a formal framework, and you can start using Flux immediately without a lot of new code.
Build a universal GraphQL API on top of your existing REST APIs, so you can ship new application features fast without waiting on backend changes.
See all alternatives