Mastering code performance is crucial for efficient R programming. Learn how to use built-in R tool `Rprof` and the `microbenchmark` package to profile and benchmark your code, identifying bottlenecks and areas for improvement to optimize your R code.

Deprecating older versions of an API is crucial for a smooth transition to new versions and to minimize disruptions to clients. Key considerations include establishing a sunset policy, notifying clients, redirecting traffic, and maintaining security patches and bug fixes. Effective deprecation and maintenance strategies ensure a positive user experience.

Integrate C++ and QML to create a simple application, leveraging the strengths of both languages for efficient, engaging, and robust results. Learn how to structure your project, create a C++ backend class, and expose its functionality to QML. With step-by-step guidance, you'll master the process of combining C++ and QML for complex logic and visually appealing UIs.