R Advanced Quiz 3

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Quiz 3
1. What is the primary purpose of the `R6` package?
2. Which function applies a function over a list of lists?
3. What is the difference between `[[` and `[` for lists?
4. Which function defines a S3 method for a generic?
5. What does `sys.call()` return?
6. Which function is used for C++ integration in Rcpp?
7. What is a 'promise' in R evaluation?
8. How to get the body of a function?
9. What does the `rlang` package specifically improve?
10. How to list all methods for a generic?
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