Check out all our TypeScript tutorials.
When building a web application using TypeScript, checking the length of user input is a common and important task. For example, on a user registration form for an e-commerce website, you may want to ensure that the username is at least 5 characters long, the password has a minimum of 8 characters, and the description … Read more >>
Recently, I was working on a feature using TypeScript that required displaying user details retrieved from an external API. In that, I got an unexpected error of undefined values for some optional fields. For this, it was required to check whether those properties actually existed on the object before using them. TypeScript provides several ways … Read more >>
While building a TypeScript function, you might want to accept an object as a parameter, but you don’t care what properties it has; you want to make sure it’s some object and not a string, number, or null. For example, you are writing a logging function that accepts any object and prints it to the … Read more >>
I was working on a TypeScript project that tracked the status of different cities. There, I got a challenge that the list of city names kept changing, and I didn’t know all the keys ahead of time. At first, I tried using a loose object type, but that quickly led to confusion and potential errors. … Read more >>
When you start a new React project, you might think Should I use JavaScript or try TypeScript? JavaScript is easier to begin with, but TypeScript helps you write cleaner and safer code. Picking the right one can significantly impact how quickly you work, the quality of your code, and the effectiveness of your team collaboration. … Read more >>
While working on a TypeScript project, I had to deal with data coming from an external source, and I wasn’t sure what type it would be. At first, I used any type to make things easier, but it quickly caused errors that TypeScript didn’t catch. That’s when I looked into the unknown type. It seemed … Read more >>
While building an online shopping app in TypeScript, you first use namespaces to group code like Customer, Product, and Order in one file. It works fine for small projects. However, as the app grows, you can switch to modules to split code into separate files using export and import, making it easier to manage. TypeScript, … Read more >>
While working on a TypeScript project, I got a requirement to map enum values back to their corresponding names, essentially the reverse of how enums are typically used. With numeric enums, TypeScript handles this automatically. But when it came to string enums, I had to implement a custom solution to make reverse mapping work. In … Read more >>
You may have faced some issues where your code breaks because an object is undefined. For example, you’re trying to access a property of an object, but that object was never assigned a value. In such cases, checking if the object is undefined helps prevent runtime errors and keeps your code safe. In this tutorial, … Read more >>
In TypeScript, there are two operators that can be used for handling default values: the nullish coalescing operator (??) and the logical OR operator (||). While they may seem similar at first glance, they have key differences in their behavior. In this tutorial, we’ll learn about the nullish coalescing operator and the logical OR operator … Read more >>
Download a FREE PDF (112 Pages) Containing 51 Useful Python Programs.
Download a FREE PDF on how to become a Python developer.