Before I start, a small backstory. So, a few weeks back, there was a requirement in an angular project I was working on, wherein I had to keep a piece of data intact so that several other components could use it. My React instinct suggested me of using some angular version of context API which led me to 3 Angular ways of managing states and keeping data intact.
Component State: For Simple applications or components with minimal shared data, we can manage state within individual components using Angular's component properties and event binding. This was clearly out of league because I needed to share data across multiple components.
Service Based State Management: Services can be used to create centralized state management solutions. But performance and scalability of the application will take a hit following this approach.
ngRx Store: ngRx store provides centralized state management capabilities. NGRX uses RxJS observables and actions to manage state.
Out of the three ngRx Store seemed to be the most suitable one to go with.
Implementing ngRx Store:
To better understand the implementation of ngRx, we first need to understand how ngRx works in the first place.
The flow starts from the component. The good thing about ngRx is our component doesn't need to know how to manage the state. Only thing it is concerned about is dispatching an action to inform something happened (an event) like the user clicked on the delete button.
At this point the reducer comes into play. Reducer is responsible for determining how a particular action should modify state. Usually we have reducer for every entity we want to manage state for. So, Reducer detect all the action being dispatched in the app and determine how the state should be modified and once modified, stores the updated state in the ngRx Store (which is a global store for all the states across the application).
Finally, when a component wants to access the store, the component uses a selector to pull in the state that it needs from the store.
Now let's get our (actually my) hands dirty and implement a store for a Todo application.
Step 1: Creating action
Inside the createAction method, we are passing two parameters - a unique string that will be used to distinguish an action, another is the payload we want to send (optional).
Step 2: Creating Reducers
In the reducer, we pass the initial state and the task to perform on dispatching a particular action.
Step 3: Dispatching Action
We dispatch an action by calling the dispatch method of the store passing the action to it.
Step 4: Creating selector
AppState refers to the central store for the whole application from which we selecting the todo state. Now we can start consuming the store data like I did in the Dispatching Actions code's line no. 11.
Finally, we need to add the todoReducer in our imports of the App Module so that it is available across the application.
Conclusion
In this blog, I summarized and explained the ngRx store in details, how it works and how can we implement it in our application. ngRx store can be very useful as the application grows, to store data and access it across different components. Hope it helped ;)
The above is the detailed content of ngRx Store in Angular. For more information, please follow other related articles on the PHP Chinese website!

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

Atom editor mac version download
The most popular open source editor

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment