r - performing calculation by calling values with .$ and .[ ] -

this purely conceptual question, how refer elements of vector c(2,3) in calculation using .$ or .[]?

library(tidyverse)  c(2, 3) %>%    .[1] * .[2]

this code works fine requires temporary object (v) created:

v <- c(2,3) v[1] * v[2]

and i'd know how perform calculation in tidyverse without creating temporary object v.

we need place braces avoid operator precedence

c(2, 3) %>%         {.[1] * .[2]} #[1] 6

also, use map2 multiply corresponding elements (tidyverse)

map2_dbl(2, 3, `*`) #[1] 6  map2_dbl(2:5, 6:9, `*`) #[1] 12 21 32 45

or reduce

c(2, 3) %>%      reduce(`*`) #[1] 6  list(2:5, 6:9) %>%             reduce(`*`) #[1] 12 21 32 45

Single