R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  f i n d . R  tests
> ##
> 
> finds <- pracma::finds
> 
> v <- c(3, 2, 1, 1, 2, 3)
> identical(finds(v == 1), c(3L, 4L))
[1] TRUE
> v <- c(1, 0, 4, -3, 0, 0, 0, 8, 6)
> identical(finds(v), as.integer(c(1, 3, 4, 8, 9)))
[1] TRUE
> identical(finds(v > 2), c(3L, 8L, 9L))
[1] TRUE
> identical(finds(c()), integer(0))
[1] TRUE
> identical(finds(c(TRUE, FALSE, TRUE, FALSE, TRUE)), c(1L, 3L, 5L))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.15    0.00    0.15