R Advanced Quiz 1

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Quiz 1
1. Which function is used for functional programming to reduce a list to a single value?
2. What does the `pryr` package's `otype()` function identify?
3. Which mechanism allows an R function to modify its own arguments?
4. What is the difference between `browser()` and `debug()`?
5. Which function is used for memory profiling in R?
6. What is the primary purpose of `Environment` objects in R?
7. How to force a promise to evaluate immediately?
8. Which package is the gold standard for R-to-C++ integration?
9. What does the `...` (ellipsis) operator allow in a function?
10. How do you create an S4 class?
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