The Internal of the TypeScript Compiler Explained — After working with TypeScript for a few years, I felt I had a good understanding of the language except I don’t really know how the compiler works internally. Recently, I got a chance to dig into the area that I knew very little about, and would like to share with…

What I’ve learned from using TypeScript’s type system — TypeScript is about types. It’s a strongly typed language with powerful compile-time type-checking. At the same time, its static typing is optional, so it’s compatible with JavaScript. I’ve been working with TypeScript for more than three years. I’ve learned a lot during this journey, but I still have the nice…

Everything you want to know about the Record utility type — Record is one of the TypeScript utility types and has been available out of the box since version 2.1. I have to admit that I was a little confused when I read the official definition for the first time: “Record<Keys,Type> Constructs an object type whose property keys are Keys and…

A cleaner, loose coupled and more maintainable solution — In this article, I will talk about how to use the Decorator pattern to consume REST API in Angular. HttpClient Service Consuming REST API data using HttpClient in Angular is the most common way of connecting an Angular App to the back end services. HttpClient Service handles the JSON data parsing under…

Tips to study, prepare and pass the exam — I recently completed my certification exam for CKAD(Certified Kubernetes Application Developer). It’s a totally hands on exam. You need to solve the problem in live environments. Thus it isn’t an easy exam to pass. In my opinion, it’s more valuable than a traditional MCQ exam. In this article, I am…

These hidden gems can help you to build an efficient and maintainable app — NestJS is a complex framework and evolving continuously. It’s a great framework with many out-of-box features. Some features are not-well known and under-utilized, but they could be very useful when placed in the right place. In this article, I’m going to walk through 5 hidden gems. Versioning Versioning is essential for…

A step-by-step tutorial to build a booking system — Telehealth services can improve access to healthcare for people living in remote areas. One common issue in remote areas is unreliable internet service. It’s a challenge for patients in remote areas to make appointments via web applications when internet service is poor or not available at all. SMS is a…

Examine various approaches to pass data between components — Working on an Angular App requires to compose different components together, and passing data between them. A common approach to pass data from parent component to child component is to use the input property setter. We all know getter and setter, they are simply for intercepting accesses to a property. …

A Step-by-step guide to setup a forever free virtual machine and configure the website — I live in Queensland, Australia. The COVID-19 virus is spreading quickly across the sunshine state, and everybody is worried. The idea for this website surfaced when I tried searching for Covid stats for my suburb. Surprisingly, I couldn’t find this data easily. Thus, I decided to build a website myself. …