Generics. A variable is defined as generic interface type with underlying types for T and U. typescript-generics-in-interfaces interface-generics-extending-interfaces.ts interface-generics-with-classes.ts typescript documentation: Generic Interfaces. So, components can be called or used with a variety of data types. Taking all of the above into consideration we can specify our Props interface. Thus, kvProcessor class can be used with any type of key and value. Furthermore, you can apply generics in TypeScript to classes, interfaces, and functions. It still represents having a single property called label that is of type string.Notice we didn’t have to explicitly say that the object we pass to printLabel implements this interface like we might have to in other languages. so i want to make some kind of base interface/type that can have the properties extended based on the generic object it has. somekind like this: interface BaseObject<Extension extends object … The point is that in your code, you don’t care if it is an Interface or not, what you care about is that it is a type (not the keyword “type” but just the generic concept, “type”). When you have more types, interfaces, and union types than you need, your code will get more difficult to read and maintain. By the use of generic, we can define generic class, generic interface, generic function in TypeScript. In TypeScript, we can create generic classes, generic functions, generic methods, and generic interfaces. First, let’s define the requirements for our generic table component. Without the “I” Here, it’s only the shape that matters. Generics offer a way to create reusable components. Without generic, we have to maintain so many methods which return a different type of input as the result, but the logic inside them is nearly same. Generics in TypeScript is almost similar to C# generics. But in the end, the “type” and the “interface” really can be used the same way and the differentiation is completely wasted. The interface LabeledValue is a name we can now use to describe the requirement in the previous example. With generics, you can write dynamic and reusable generic blocks of code. In the above example, the generic class kvProcessor implements the generic interface IKeyValueProcessor.It does not specify the type parameters T and U, instead it allows users to set them themselves. The below example helps us to understand the generics clearly. Introducing generic components. It needs to: accept an array of entities of any type, process an array of properties that we want to display in a table. Generics provide a way to make components work with any data type and not restrict to one data type. Example. In TypeScript you can define Generic Classes,Interfaces and functions.Generic functions ,generic interfaces and generic classes work with different data types using the concept of type parameters. This modified text is an extract of the original Stack Overflow Documentation created by following contributors and released under CC BY-SA 3.0 Generics is concept used in different programming languages.Generic are used for defining reusable elements such as classes,methods and interfaces. TypeScript can increase the code complexity of your project if you’re using it the wrong way. In this article, you will integrate generics into your TypeScript code and apply them to functions and classes. Let's see why we need Generics using the following example. 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