Writing tests for our application helps ensure it works as intended and is reliable. So far, we have written unit tests for our NestJS application that uses the Drizzle ORM. Unit tests help us check if a particular class of a single function functions properly on its own. While unit tests are important, they are […]
Inheritance is one of the four pillars of object-oriented programming. JavaScript has the prototype-based inheritance, and with it, one object can acquire properties of another object. Even though JavaScript has the class keyword, it still uses prototypes under the hood. If you want to know to know more about prototypes, check out this article I wrote […]
Making sure that the application is secure is one of the most important tasks of a developer. This is a vast topic, and in this article, we tackle it by adding a set of HTTP headers. The Helmet is a middleware for Express applications. It sets many different HTTP headers and aims to make applications […]
JavaScript NestJS TypeScript Uncategorized
NestJS subscribes to the idea that a microservice is an application that uses a different transport layer than HTTP. Therefore, in the previous part of this series, we’ve used TCP. However, with NestJS, we have a broad selection of transporters that transmit messages across microservices. Each one of them is different, and it is worth exploring […]
JavaScript TypeScript Uncategorized
Previously, we’ve discussed the basics of TypeScript Generics. This time, we take them to a higher level. In this article, we learn about index types. To do so, we also explore union types, the keyof keyword, and string literal types. Today we also learn mapped types and use them with conditional types. Index types Generics are very useful in many situations. […]
We can find the concept of generic types across many languages such as Java, C#. Naturally, they found their way into TypeScript. In this article, we discuss their purpose and provide various examples. We also discuss naming conventions for generics that we can stumble upon. Introducing TypeScript Generics One of the qualities that we strive […]
WebSocket is a protocol that makes two-way communication in real-time between the user and the server possible. A common use cases are chats and online multiplayer games. Today we cover implementing it both on frontend and backend. Let’s go! Explaining WebSockets WebSocket is a different protocol than HTTP. Despite that, to establish a connection, the client sends […]
