Fastest way to count objects in an R environment

as.list.environment.R

# Compare performance of ls() with as.list.environment() for counting objects
# length(as.list.environment()) is fastest

env <- environment(plot) # A handy, large environment

bench::mark(length(ls(env)), length(as.list(env)))
# # A tibble: 2 x 13
#   expression                min   median `itr/sec` mem_alloc `gc/sec` n_itr  n_gc total_time result    memory time     gc
#   <bch:expr>           <bch:tm> <bch:tm>     <dbl> <bch:byt>    <dbl> <int> <dbl>   <bch:tm> <list>    <list> <list>   <list>
# 1 length(ls(env))        4.69ms   4.96ms      198.        NA        0    99     0      501ms <int [1]> <NULL> <bch:tm> <tibble [99 × 3]>
# 2 length(as.list(env))   3.44ms   4.03ms      240.        NA        0   120     0      500ms <int [1]> <NULL> <bch:tm> <tibble [120 × 3]>