detect.md
In purrr: Functional Programming Tools

`detect()` requires a predicate function

Code
  detect(list(1:2, 2), is.na)
Condition
  Error in `detect()`:
  ! `.f()` must return a single `TRUE` or `FALSE`, not a logical vector.

Code
  detect_index(list(1:2, 2), is.na)
Condition
  Error in `detect_index()`:
  ! `.f()` must return a single `TRUE` or `FALSE`, not a logical vector.

`.right` argument is retired

Code
  . <- detect(1:2, ~TRUE, .right = TRUE)
Condition
  Warning:
  The `.right` argument of `detect()` is deprecated as of purrr 0.3.0.
  i Please use the `.dir` argument instead.
Code
  . <- detect_index(1:2, ~TRUE, .right = TRUE)
Condition
  Warning:
  The `.right` argument of `detect_index()` is deprecated as of purrr 0.3.0.
  i Please use the `.dir` argument instead.