TLDR This question does not need to be overly explained. The short answer is yes. Functions can be strongly typed — even as parameters to other functions. How to use strongly typed function parameters The accepted answer on this stack overflow post is correct — to a degree. Assuming you had a function: speak: function speak(callback) {…

TLDR Extend the existing interface declaration for the Window object. Introduction Knowledge builds upon knowledge. Whoever said that was right. In this section, we will build upon the knowledge from the last two sections: Interfaces vs Types in Typescript What is a d.t.s file in Typescript Ready? First, I must say, in…

TLDR .d.ts files are called type declaration files. They exist for one purpose only: to describe the shape of an existing module and they only contain type information used for type checking. Introduction Upon learning the basics of TypeScript, you unlock superpowers. At least that’s how I felt. You automagically get warnings…

TLDR This is technically called the non-null assertion operator. If the typescript compiler complains about a value being null or undefined, you can use the ! operator to assert that the said value is not null or undefined. Personal take: avoid doing this wherever possible. What is the non-null assertion operator? null and undefined are valid Javascript…

React hooks were added to React in version 16.8. With the transition from class to functional components, hooks let you use state and other features within functional components i.e without writing a class component. This reference guide will discuss all the hooks natively available in React, but first, let’s start…

I published an Intermediate Typescript and React Handbook a few weeks ago. It received numerous views and I got several emails. Most were “thank you” emails, but then there were others like: “… I am new to programming, what is Typescript?” “Thanks for this free ebook, but how do I…

How to run on-site advertising that provides a seamless experience leveraging your company’s component libraries. Since the inception of online advertising, users have always complained about the design and relevancy of ads. …

What no one tells you — Click to read for free — if blocked behind the Medium paywall. The studies on learning and mastery are clear. You don’t get better or achieve mastery at a skill by just practicing the same thing repeatedly. You also won’t get better by just reading. Neither is mastery solely the…

A 5-yr old guide to understanding lifecycle methods. — Click to read for free — if blocked behind the Medium paywall. He’s been writing software for a while, but new to the React ecosystem. Meet John.