簡單講就是
NgRx = Redux + RxJS + Angular
但是 Redux 又是什麼

我需要用 NgRx嗎

你不應該使用 NgRx

到底要不要用 NgrX 基本上有一個所謂的 SHARI 準則：

• Shared: state that is accessed by many components and services.

• Hydrated: state that is persisted and rehydrated from external storage.

• Available: state that needs to be available when re-entering routes.

• Retrieved: state that must be retrieved with a side-effect.

• Impacted: state that is impacted by actions from other sources.

參考

1. NgRx.io
2. 你或許看過四不像，但是你聽過四很像嗎？：NgRx