str-count-vs-nchar

str-count-vs-nchar.md

vec <- sample(1:10000)
vec[sample(1:100)] <- NA

bm <- bench::mark(
  str_count = stringr::str_count(vec),
  nchar = nchar(vec)
)

summary(bm)
#> # A tibble: 2 × 6
#>   expression      min   median `itr/sec` mem_alloc `gc/sec`
#>   <bch:expr> <bch:tm> <bch:tm>     <dbl> <bch:byt>    <dbl>
#> 1 str_count    2.24ms   2.37ms      390.     837KB     0   
#> 2 nchar      661.45µs  688.1µs     1448.     117KB     2.01
summary(bm, relative = TRUE)
#> # A tibble: 2 × 6
#>   expression   min median `itr/sec` mem_alloc `gc/sec`
#>   <bch:expr> <dbl>  <dbl>     <dbl>     <dbl>    <dbl>
#> 1 str_count   3.39   3.44      1         7.14      NaN
#> 2 nchar       1      1         3.71      1         Inf

^{Created on 2025-07-07 with reprex v2.1.1}

Session info

sessioninfo::session_info()
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#>  date     2025-07-07
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