Javascript

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TypeScript Fundamentals TypeScript adds static typing to JavaScript, making code more maintainable and catching errors early. Type Definitions // Basic types type User = { id: number; name: string; email: string; active?: boolean; }; // Union types type Status = 'pending' | 'active' | 'inactive'; // Generic interfaces interface Repository<T> { find(id: string): Promise<T>; save(item: T): Promise<T>; } Advanced Patterns // Discriminated unions type Shape = | { kind: 'circle'; radius: number } | { kind: 'rectangle'; width: number; height: number }; function getArea(shape: Shape): number { switch (shape.kind) { case 'circle': return Math.PI * shape.radius ** 2; case 'rectangle': return shape.width * shape.height; } } Best Practices Use strict mode { "compilerOptions": { "strict": true } } Prefer interfaces for public APIs Use type inference when possible Leverage const assertions Implement proper error handling Stay tuned for more TypeScript tips! ...