Mastering TypeScript

TypeScript has become an essential tool for modern JavaScript development. Let's explore advanced patterns and techniques that will take your TypeScript skills to the next level.

Generics

Generics allow you to write reusable, type-safe code:

function identity<T>(arg: T): T {
  return arg;
}

const result = identity<string>("Hello");

Utility Types

TypeScript provides several built-in utility types:

• "Partial" - Makes all properties optional
• "Required" - Makes all properties required
• "Pick<T, K>" - Creates a type with selected properties
• "Omit<T, K>" - Creates a type without selected properties

Advanced Patterns

Discriminated Unions

type Success = { status: "success"; data: string };
type Error = { status: "error"; error: string };
type Result = Success | Error;

function handleResult(result: Result) {
  if (result.status === "success") {
    console.log(result.data);
  } else {
    console.error(result.error);
  }
}

Conclusion

Mastering these advanced TypeScript features will help you write more maintainable and type-safe code.