Suppose you're developing a package in R and need to use function closures to maintain state between function calls. How would you do this?

  • Define a parent function that returns the nested function, which captures and retains the state in its environment
  • Use the assign() function to store the state as a global variable
  • Pass the state as an argument to each function call
  • All of the above
To use function closures to maintain state between function calls in a package in R, you can define a parent function that returns the nested function. The nested function captures and retains the state in its environment, allowing it to remember previous states across multiple calls. This approach ensures that the state is encapsulated within the function and not exposed as a global variable.
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