Simply checks if a list contains a given object.

  • NB1: Objects are compared with identity.

  • NB2: Only use this on lists with complex objects, for simpler structures there are faster operations.

  • NB3: Clones of R6 objects are not detected.

has_element(.x, .y)



:: (list() or atomic vector).


:: any
Object to test for.


has_element(list(1, 2, 3), 1)
#> [1] TRUE