Lära Practical Use Cases for Generics


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// A generic data container class
class DataContainer<T> {
  private data: T;

  constructor(initialData: T) {
    this.data = initialData;
  }

  getData(): T {
    return this.data;
  }

  setData(newData: T): void {
    this.data = newData;
  }
}

// Instantiating with a string
const stringContainer = new DataContainer<string>("Hello, world!");
console.log(stringContainer.getData()); // Output: Hello, world!

// Instantiating with a number
const numberContainer = new DataContainer<number>(42);
console.log(numberContainer.getData()); // Output: 42

Generics in TypeScript classes allow you to write flexible, reusable components that can handle a variety of data types while maintaining type safety. Instead of creating multiple versions of a class for each data type, you can use a single generic class and specify the type when you instantiate it. This approach is especially useful for building libraries, utility classes, or data structures like stacks, queues, and repositories, where the underlying data type might change depending on the use case.

For instance, a generic data container class lets you store and manage any type of data—such as strings, numbers, or even custom objects—without losing the benefits of strong typing. This reduces code duplication and makes your codebase easier to maintain. By leveraging generics, you ensure that only the correct type of data is stored and retrieved, which helps prevent runtime errors and increases reliability in larger applications.

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              123456789101112131415161718192021222324
            
// A generic data container class
class DataContainer<T> {
  private data: T;

  constructor(initialData: T) {
    this.data = initialData;
  }

  getData(): T {
    return this.data;
  }

  setData(newData: T): void {
    this.data = newData;
  }
}

// Instantiating with a string
const stringContainer = new DataContainer<string>("Hello, world!");
console.log(stringContainer.getData()); // Output: Hello, world!

// Instantiating with a number
const numberContainer = new DataContainer<number>(42);
console.log(numberContainer.getData()); // Output: 42

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 4. Kapitel 4