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”). Furthermore, you can apply generics in TypeScript to classes, interfaces, and functions. 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. It needs to: accept an array of entities of any type, process an array of properties that we want to display in a table. A variable is defined as generic interface type with underlying types for T and U. When you have more types, interfaces, and union types than you need, your code will get more difficult to read and maintain. 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. TypeScript Generics is almost similar to C# and Java generics. Here, it’s only the shape that matters. somekind like this: interface BaseObject<Extension extends object … In this article, you will integrate generics into your TypeScript code and apply them to functions and classes. Without the “I” In TypeScript, we can create generic classes, generic functions, generic methods, and generic interfaces. typescript-generics-in-interfaces interface-generics-extending-interfaces.ts interface-generics-with-classes.ts But in the end, the “type” and the “interface” really can be used the same way and the differentiation is completely wasted. Generics is concept used in different programming languages.Generic are used for defining reusable elements such as classes,methods and interfaces. Using generics can help you achieve this in your TypeScript code. Let's see why we need Generics using the following example. With TypeScript, and leveraging the IQuery interface, you’d pass in Album type as the first Generic parameter to ensure the shape of what the promise emits always matches Album type. Example. Thus, kvProcessor class can be used with any type of key and value. 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. This modified text is an extract of the original Stack Overflow Documentation created by following contributors and released under CC BY-SA 3.0 First, let’s define the requirements for our generic table component. Introducing generic components. Generics offer a way to create reusable components. Generics. so i want to make some kind of base interface/type that can have the properties extended based on the generic object it has. Generics provide a way to make components work with any data type and not restrict to one data type. typescript documentation: Generic Interfaces. The below example helps us to understand the generics clearly. 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. TypeScript can increase the code complexity of your project if you’re using it the wrong way. By the use of generic, we can define generic class, generic interface, generic function in TypeScript. 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. 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