Display tree of references

Source: R/ref.R

This tree display focusses on the distinction between names and values. For each reference-type object (lists, environments, and optional character vectors), it displays the location of each component. The display shows the connection between shared references using a locally unique id.

ref(..., character = FALSE)

Arguments

...

One or more objects

character

If TRUE, show references from character vector in to global string pool

See also

Other object inspectors: ast(), sxp()

Examples

x <- 1:100
ref(x)
#> [1:0x56ba5fef7570] <int> 

y <- list(x, x, x)
ref(y)
#> █ [1:0x56ba5f86db18] <list> 
#> ├─[2:0x56ba5fef7570] <int> 
#> ├─[2:0x56ba5fef7570] 
#> └─[2:0x56ba5fef7570] 
ref(x, y)
#> [1:0x56ba5fef7570] <int> 
#>  
#> █ [2:0x56ba5f86db18] <list> 
#> ├─[1:0x56ba5fef7570] 
#> ├─[1:0x56ba5fef7570] 
#> └─[1:0x56ba5fef7570] 

e <- new.env()
e$e <- e
e$x <- x
e$y <- list(x, e)
ref(e)
#> █ [1:0x56ba6026be90] <env> 
#> ├─x = [2:0x56ba5fef7570] <int> 
#> ├─y = █ [3:0x56ba5d058578] <list> 
#> │     ├─[2:0x56ba5fef7570] 
#> │     └─[1:0x56ba6026be90] 
#> └─e = [1:0x56ba6026be90] 

# Can also show references to global string pool if requested
ref(c("x", "x", "y"))
#> [1:0x56ba60585568] <chr> 
ref(c("x", "x", "y"), character = TRUE)
#> █ [1:0x56ba61224e08] <chr> 
#> ├─[2:0x56ba59ba2fe0] <string: "x"> 
#> ├─[2:0x56ba59ba2fe0] 
#> └─[3:0x56ba59cb2b28] <string: "y">