turtles-on 2.0

turtles-on turtle or patch

turtles-on turtleset or agentset

<breeds>-on turtle or patch

<breeds>-on turtleset or patchset

Reports an agentset containing all the turtles that are on the given patch or patches, or standing on the same patch as the given turtle or turtles.

ask turtles [
  if not any? turtles-on patch-ahead 1
    [ fd 1 ]
]
ask turtles [
  if not any? turtles-on neighbors [
    die-of-loneliness
  ]
]

If the name of a breed is substituted for “turtles”, then only turtles of that breed are included.