دانلود کتاب الگوهای طراحی Node.js

Node.js is considered by many a game-changer—possibly the biggest innovation of the decade in web development. It is loved not just for its technical capabilities, but also for the paradigm shift that it introduced in web development and, in general, in the software development ecosystem. First, Node.js applications are written in JavaScript, the most adopted language on the web and the only programming language supported natively by every web browser. This aspect enables scenarios such as single-language application stacks and the sharing of code between the server and the client. A single language also helps to reduce the gap between frontend and backend engineers, making backend programming extremely approachable and intuitive for frontend developers. Once you are acquainted with Node.js and JavaScript, you can easily build software for a wide variety of platforms and contexts. Node.js itself is contributing to the rise and evolution of the JavaScript language. People realize that using JavaScript on the server brings a lot of value, and they are loving it for its pragmatism, for its flexibility, its event-driven approach, and for its hybrid nature, halfway between object-oriented and functional programming. The second revolutionizing factor is Node.js’ single-threaded programming model and its asynchronous architecture. Besides obvious advantages from a performance and scalability point of view, this characteristic changed the way developers approach concurrency and parallelism. Mutexes are replaced by queues, threads by callbacks, and synchronization by causality. These abstractions are generally simpler to adopt than their traditional counterparts, but they are still extremely powerful, allowing developers to be very productive while solving day-to-day challenges.