Editing Generator (computer programming) (section)

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Every expression (including loops) is a generator. The language has many generators built-in and even implements some of the logic semantics using the generator mechanism ([[logical disjunction]] or "OR" is done this way).

Printing squares from 0 to 20 can be achieved using a co-routine by writing:
<syntaxhighlight lang="icon">
   local squares, j
   squares := create (seq(0) ^ 2)
   every j := |@squares do
      if j <= 20 then
         write(j)
      else
         break
</syntaxhighlight>

However, most of the time custom generators are implemented with the "suspend" keyword which functions exactly like the "yield" keyword in CLU.