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4.0. Conditions

In this chapter, the REXX concept of “conditions” is described.
Conditions allow the programmer to handle abnormal control flow,
and enable him to assign special pieces of REXX code to be
executed in case of certain incidences.

·    In the first section the concept of conditions is explained.

·    Then, there is a description of how a standard condition in
  REXX would work, if it existed.

·    In the third section, all the existing conditions in REXX are
  presented, and the differences compared to the standard condition
  described in the previous section are listed.

·    The fourth sections contains a collections of random notes on
  the conditions in REXX.

·    The last section describes differences, extensions and
  peculiarities in Regina on the of subject conditions, and the
  lists specific behavior.