When looking through other TypeScript libraries' source code, maybe you have encountered a strange exclamation mark operator placed after a member. This operator is a TypeScript-only feature and does not exist in JavaScript. It is called the non-null assertion [...]
Named parameters exist in multiple languages such as C# or PHP, and developers from those languages may expect that TypeScript also provides this feature. Unfortunately, this language does not provide true named parameters. However, it is still possible to [...]
Sometimes, developers need to declare class constants accessible by all the class's methods. Luckily, this is very easy to accomplish in TypeScript.
To declare class constants in TypeScript, you can use the readonly keyword, like so:
class Cat { [...]
Sometimes developers need to define a default parameter for a TypeScript function. Luckily, TypeScript, just like its counterpart JavaScript, offers a simple way to define default parameters.
In TypeScript, you can define a default parameter like so:
const getUser [...]
TypeScript, just like such languages as C# or Java, provides support for abstract classes. It is a valuable feature since JavaScript doesn't support the abstract keyword. This brings the question of what is an abstract class and how it [...]
In TypeScript, checking if a variable or argument is defined is one of the most common tasks. Luckily, it is simple to accomplish.
The easiest way to check for undefined in TypeScript is to use a condition check, like [...]
TypeScript is a programming language that offers many advantages compared to conventional JavaScript. Its most important advantage is the addition of typings. One of the typings added by TypeScript is the never type.
This article will explain, in detail [...]
TypeScript, just like JavaScript, provides support for static methods, properties, and initialization blocks. This brings the question of what a static class is and how it works in TypeScript.
A static class contains static properties and methods and is [...]
As you may know, TypeScript is a strongly typed language. By default, when you declare a function with parameters, you need to pass values for each parameter when you call it. Sometimes, however, developers may want to make a [...]
TypeScript offers many different utility types that help transform other types. One of the most helpful utility types provided by TypeScript is the Omit type.
The Omit type creates a new type by excluding one or multiple properties from [...]