lobstr provides tools in the same vein as str()
, which allow you to dig into the detail of an object.
Install the released version of lobstr from CRAN:
You can install the development version with:
ast()
draws the abstract syntax tree of R expressions:
ref()
shows hows objects can be shared across data structures by digging into the underlying __ref__erences:
x <- 1:1e6
y <- list(x, x, x)
ref(y)
#> █ [1:0x35fbf98] <list>
#> ├─[2:0x2f8e6d0] <int>
#> ├─[2:0x2f8e6d0]
#> └─[2:0x2f8e6d0]
e <- rlang::env()
e$self <- e
ref(e)
#> █ [1:0x2dc6da8] <env>
#> └─self = [1:0x2dc6da8]
A related tool is obj_size()
, which computes the size of an object taking these shared references into account:
cst()
shows how frames on the call stack are connected: