Advanced TypeScript Patterns

TypeScript’s type system is incredibly powerful. Let’s explore advanced patterns.

Conditional Types

type IsString<T> = T extends string ? true : false;
type Result = IsString<"hello">; // true

Mapped Types

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

Type Guards

function isUser(obj: any): obj is User {
    return 'name' in obj && 'email' in obj;
}

Utility Types

• Partial<T> - Makes all properties optional
• Required<T> - Makes all properties required
• Pick<T, K> - Select specific properties
• Omit<T, K> - Exclude specific properties

Master these patterns for bulletproof TypeScript code!