#!@OOREXX_SHEBANG_PROGRAM@
/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 2005-2014 Rexx Language Association. All rights reserved.    */
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/*                                                                            */
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/*                                                                            */
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/*                                                                            */
/*----------------------------------------------------------------------------*/
/******************************************************************************/
/*  arrayCallback.rex        Open Object Rexx Samples                         */
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/* -------------------------------------------------------------------------- */
/*                                                                            */
/*  Description:                                                              */
/*  This program demonstrates now routines can be used to perform a function  */
/*  over all elements in an array.                                            */
/******************************************************************************/
start = .array~of("Rick", "Mike", "David", "Mark")

-- display the starting set of string
say "Original strings:"
say
call map start, .routines~sayit
-- reverse all of the strings, returned as a new array
new = map(start, .routines~reversit)
-- display all of the reversed strings
say
say "Reversed strings:"
say
call map new, .routines~sayit


-- a function to perform an iterated callback over an array
-- using the provided function.  Returns an array containing
-- each function result
::routine map
  use strict arg array, function
  resultArray = .array~new(array~items)
  do item over array
     resultArray~append(function~call(item))
  end
  return resultArray

-- a routine used for callback operations to reverse
-- a string
::routine reversit
  use arg string
  return string~reverse

-- a routine used for callback operations to display a
-- string value
::routine sayit
  use arg string
  say string
  return .true   -- called as a function, so a result is required