How a popular psychology hypothesis is being misrepresented online — From the media to the workplace, it’s easy to spot people with an overinflated sense of their own ability. This phenomenon is explained by the Dunning-Kruger effect, a hypothesis that people who are bad at a task or skill have a cognitive bias towards thinking they’re better than they are. …

The power of parallel when writing asynchronous JavaScript — and the traps to look out for! — In many web development projects, important functionality depends on asynchronous code — whether that’s making HTTPS requests to an API, querying and updating a database, or managing time-sensitive tasks like reading large files. But are you making sure that your asynchronous code is optimised to run as efficiently as possible?

Things I didn’t find in any tutorial — I have now been paid to write code for over two years. In that time, my views about programming have changed a lot. For me, the most important lessons weren’t about learning the intricacies of a particular language or framework. Instead, my biggest mental shifts have been more about understanding…

Numeric separators, Logical assignment operators, and more — Since 2015, JavaScript has enjoyed yearly language updates. 2021 is no different: this year, several new features reached Stage 4 of the TC39 Process and are already available in Node.js and most major modern browsers. In this article, we’ll look into four of the most important new features. We’ll cover…

How to implement them and whether they’re actually useful — A singleton is a function or class which can have only one instance. It’s a design pattern popularised by the “Gang of Four” in their influential Design Patterns. However, the singleton is one of several patterns in the book which have been criticised. Some are regarded as anti-patterns, while others…

How to combine two of the most popular tools in web development — Right now, Typescript and React and two of the most popular technologies in web development. In this article, we’ll look into using the two technologies in tandem, covering basic type checking in functional and class components. …

Tricks with the Spread Operator and Destructuring Assignment Syntax — Among the many useful features introduced in ES6, few have the power to knock off as many lines of traditional JavaScript code as the spread operator and destructuring assignment syntax. In ES5, for example, you may have required a dedicated function to filter out unique values. …

Combine the power of TypeScript and MongoDB to create a scalable, production-grade database — MongoDB is a versatile NoSQL database, commonly paired with Node.js. Instead of tables and rows, it uses collections and documents to store data. …

A tricky problem due to Catalina’s read-only root folder — Recently, I started a new developer job and switched from a Windows to a Mac. The switch was mostly very smooth, with one main problem: setting up MongoDB. The problem is related to the latest major macOS release, Catalina, and in this article, I’ll share my solution. Setting up MongoDB…