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mobx

Simple, scalable state management.

  • 6.13.5
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What is mobx?

MobX is a state management library for JavaScript applications. It enables developers to manage the application state outside of UI frameworks in a reactive way that ensures that the state is consistent and predictable. MobX uses observable data structures and automatically tracks changes, updating the UI when necessary.

What are mobx's main functionalities?

Observable State

Create observable state that can be tracked and updated. When the state changes, MobX will automatically propagate changes to any computed values or reactions that depend on the changed state.

import { observable } from 'mobx';

const appState = observable({
  count: 0,
  increment: function() {
    this.count++;
  },
  decrement: function() {
    this.count--;
  }
});

Computed Values

Define computed values that will be re-evaluated when any observable data they depend on changes. Computed values are cached and only updated when necessary.

import { computed, makeObservable } from 'mobx';

class TodoList {
  todos = [];
  get unfinishedTodoCount() {
    return this.todos.filter(todo => !todo.finished).length;
  }
  constructor() {
    makeObservable(this, {
      todos: observable,
      unfinishedTodoCount: computed
    });
  }
}

Reactions

Reactions are a way to automatically run side effects when observable data changes. The autorun function is one type of reaction that runs immediately and then re-runs every time its dependencies change.

import { observable, autorun } from 'mobx';

const temperature = observable.box(20);

const reaction = autorun(() => {
  console.log(`Temperature is: ${temperature.get()}C`);
});

temperature.set(25); // This will trigger the autorun and log the new temperature

Actions

Actions are functions that modify observables. They are the only way to modify state in MobX, and they can be bound to the class instance using the action.bound decorator.

import { observable, action } from 'mobx';

class Store {
  @observable count = 0;

  @action.bound increment() {
    this.count++;
  }

  @action.bound decrement() {
    this.count--;
  }
}

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Package last updated on 16 Oct 2024

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