Discover the versatility and flexibility of TypeScript Generics in this blog post. Learn how to create reusable and type-safe components, functions, and data structures with the magic of generics.
TypeScript Generics provide a way to create reusable components, functions, and data structures while maintaining type safety. Let's delve into the world of generics and explore their power.
Generics in TypeScript are denoted by angle brackets '<>'. Here's a simple example:
function identity(arg: T): T { return arg; } In this example, 'T' is a type parameter that allows us to capture the type of the argument passed to the function.
Generic functions enable us to write flexible and type-safe functions. Consider this example:
function printArray(arr: T[]): void { arr.forEach(item => console.log(item)); } This function can print any type of array elements while preserving type information.
We can also create generic classes in TypeScript. Here's a simple generic stack implementation:
class Stack { private items: T[] = []; push(item: T): void { this.items.push(item); } pop(): T | undefined { return this.items.pop(); } } With this generic stack class, we can push and pop elements of any type.
Constraints allow us to restrict the types that can be used with generics. For example:
interface Lengthwise { length: number; } function logLength(arg: T): void { console.log(arg.length); } This function 'logLength' accepts only objects that have a 'length' property.
TypeScript Generics offer a powerful way to write reusable and type-safe code. By leveraging generics, developers can enhance the flexibility and maintainability of their TypeScript projects. Start exploring the world of generics and unlock a new level of type flexibility in your code!