How To Dev

Introduction This is a comprehensive page about the technologies I have shared in series format. You can view brief introductions and links to directly access each series you are interested in. In the field of software development, to deploy a product from the initial idea to its release, the standard process typically involves several stages as follows: Database : Designing and implementing the database according to business requirements, storing data during the system's operation. Backend : Handling the main logic of the system, communicating with the database and services. Frontend : Building the interface for users to interact with the system, which could be a desktop, mobile, or web application. This usually includes implementing UI/UX and integrating APIs from the backend. DevOps : Deploying the system for use, which can be done on a server or in the cloud. Testing : Applying testing methods to ensure the product meets the standards for release. Of course, these are just stan...

Introduction The Event Loop is a crucial mechanism in JavaScript (used in both browsers and NodeJS runtime environments). Despite JavaScript being single-threaded, the Event Loop enables it to handle multiple asynchronous tasks (like ` setTimeout `, ` setInterval `, ` fetch `, etc.) efficiently, similar to how multi-threading works in other programming languages. Related Components Call Stack The Call Stack is a vital concept that explains how the JavaScript engine keeps track of function calls within a program. It operates on a Last In, First Out (LIFO) structure, meaning the last function called is the first one to be executed. When a function is called, it's added to the Call Stack . Once the function completes execution, it's removed from the Call Stack. This process helps JavaScript execute tasks sequentially, in the order functions are called. Task Queue The Task Queue (also known as the Callback Queue , Event Queue , or Macrotask Queue ) contains JavaScript task...

Introduction The Facade is a structural design pattern . It helps create a simple intermediary object that interacts with multiple systems (such as subsystems ). The responsibilities of the Facade Pattern include: Simplifying complex interactions with systems through the intermediary Facade object. Hiding the complex internal operations of subsystems, making them easier to use. Frequency of use: quite high. Problem and solution In cases where some processes require interaction with multiple services or third-party systems, and these processes are needed repeatedly in various places within the system, the typical solution might be to copy and paste the logic to those places. However, this leads to duplicated code in many locations, making maintenance and updates difficult when there are changes. The solution is to use the Facade Pattern to create an intermediary object to communicate with subsystems. This allows for the implementation of complex logic in a centralized and well-defin...