task
Essentially, count the number of occurrences of =={{header| on each task page.

Output:

100 doors: 20 examples.
99 Bottles of Beer: 29 examples.
Abstract type: 10 examples.

Total: X examples.
For a full output, updated periodically, see Rosetta Code/Count examples/Full list.

You'll need to use the Media Wiki API, which you can find out about locally, here, or in Media Wiki's API documentation at, API:Query

require 'web/gethttp'
 
getAllTaskSolnCounts=: monad define
  tasks=.  getCategoryMembers 'Programming_Tasks'
  counts=. getTaskSolnCounts &> tasks
  tasks;counts
)
 
getTaskSolnCounts=: monad define
  makeuri=. 'http://www.rosettacode.org/w/index.php?title=' , ,&'&action=raw'
  wikidata=. gethttp makeuri urlencode y
  ([: +/ '{{header|'&E.) wikidata
)
 
formatSolnCounts=: monad define
  'tasks counts'=. y
  tasks=. tasks , &.>':'
  res=. ;:^:_1 tasks ,. (8!:0 counts) ,. <'examples.'
  res , 'Total examples: ' , ": +/counts
)