Node.js and WebSocket enable real-time applications with instant interactions. Advanced techniques include scaling connections, custom protocols, data synchronization, and handling disconnections. Security and integration with other services are crucial for robust, scalable apps.

Multi-tenant Angular apps share code efficiently, isolate data, use authentication, core modules, and tenant-specific configs. They employ CSS variables for styling, implement error handling, and utilize lazy loading for performance.

Node.js memory optimization: Tune garbage collection, use profiling tools, manage references, utilize WeakMap/WeakSet, implement streams, handle closures carefully, and remove event listeners properly.

Renderer2 in Angular enhances DOM manipulation with abstraction, improving maintainability and platform independence. It simplifies element creation, class management, attribute setting, event handling, and style manipulation while ensuring performance and security.

Jest mocking techniques enhance testing by isolating components, controlling time, and simulating scenarios. Advanced methods like custom matchers and dynamic mocking provide flexible, expressive tests for complex JavaScript applications.

Node.js payment gateways using Stripe or PayPal require secure API implementation, input validation, error handling, and webhook integration. Focus on user experience, currency support, and PCI compliance for robust payment systems.

Jest simplifies JavaScript testing with powerful mocking capabilities. It handles ES6 modules, complex objects, third-party libraries, async code, and time-based functions. Proper cleanup and snapshot testing enhance reliability.

GraphQL and Apollo Client revolutionize data management in React apps. They offer precise data fetching, efficient caching, and seamless state management. This powerful combo enhances performance and simplifies complex data operations.

Event-Driven Architecture in Node.js enables reactive systems through decoupled components communicating via events. It leverages EventEmitter for scalability and flexibility, but requires careful handling of data consistency and errors.

React state management evolves with Zustand and Jotai offering simpler alternatives to Redux. They provide lightweight, flexible solutions with minimal boilerplate, excellent TypeScript support, and powerful features for complex state handling in React applications.

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