lobstr provides tools in the same vein as str()
, which allow you to dig into the detail of an object.
Installation
Install the released version of lobstr from CRAN:
install.packages("lobstr")
You can install the development version with:
# install.packages("devtools")
devtools::install_github("r-lib/lobstr")
Example
Abstract syntax trees
ast()
draws the abstract syntax tree of R expressions:
References
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)
#> █ [1:0x7fed114eaea8] <list>
#> ├─[2:0x7fed21f373b8] <int>
#> ├─[2:0x7fed21f373b8]
#> └─[2:0x7fed21f373b8]
e <- rlang::env()
e$self <- e
ref(e)
#> █ [1:0x7fecf1856f00] <env>
#> └─self = [1:0x7fecf1856f00]
A related tool is obj_size()
, which computes the size of an object taking these shared references into account: