Here's a more detailed explanation of how to implement rate limiting and caching for the Google Maps Distance Matrix API:

RcppArmadillo Header Files: A Comprehensive Guide to Enhancing Code Organization and Maintainability in R Packages

Working with Rcpp Strings Variables that Could be NULL: A Comprehensive Guide to Handling NULL Values in Rcpp Projects

Understanding and Installing R Packages Across Different Environments for Data Scientists.

Package Build Ignoring Makevars Flags: A Deep Dive into R's Configuration System