Skip to main content
TECH INSIGHTS
BACK TO ARTICLES

Advanced TypeScript Patterns

•BY Tech Writer
9 MIN READ
TypeScriptJavaScriptProgrammingTypes

TypeScript offers powerful type system features that can help you write more robust code. Let's explore some advanced patterns.

Generic Constraints

typescript
interface Lengthwise {
  length: number;
}

function loggingIdentity<T extends Lengthwise>(arg: T): T {
  console.log(arg.length);
  return arg;
}

Mapped Types

typescript
type Readonly<T> = {
  readonly [P in keyof T]: T[P];
};

type Partial<T> = {
  [P in keyof T]?: T[P];
};

Conditional Types

typescript
type NonNullable<T> = T extends null | undefined ? never : T;

type ExtractArrayType<T> = T extends (infer U)[] ? U : never;

These patterns help create more flexible and type-safe APIs.