pryr provides tools to pry back the surface of R and dig into the details. It
has been developed in conjunction with
"Advanced R programming" to make
it easier to understand what's going on in R.
Install it from CRAN with install.packages("pryr").
pryr includes tools to:
-
Make it easier to understand the internal implementation of:
- promises:
uneval(),is_promise(),promise_info() - scoping and environments:
where(),rls(),parenv() - closures:
unenclose() - calls and expressions:
call_tree() - primitive types:
typenames() - copy-on-modify:
address(),track_copy()
- promises:
-
Inspect and understand R's OO systems:
- Determine which OO system an object belongs to:
otype() - Determine which OO system a function belongs to:
ftype()
- Determine which OO system an object belongs to:
-
Make it easier to compute on the language:
- Alternative ways to create functions:
make_function(),f() - A version of substitute that uses regular evaluation,
substitute_q(), and one that will substitute objects in the global environment,subs() - Tools to modify language objects:
modify_lang() dots()andnamed_dots()to get unevaluated...- Partial function evaluation:
partial() - Find all functions matching some criteria:
find_funs()
- Alternative ways to create functions:
-
To use existing R tools more easily:
%<d-%and%<a-%for creating delayed or active bindings%<c-%for creating constants (locked bindings)rebindas a more user friendly version of<<-
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