NetRexx overview - Arrays

NetRexx Overview, version 2.02 Copyright (c) IBM Corporation, 2001. All rights reserved. © | 22 May 2001
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## Arrays

NetRexx also supports fixed-size arrays. These are an ordered set of items, indexed by integers. To use an array, you first have to construct it; an individual item may then be selected by an index whose value must be in the range `0` through `n-1`, where `n` is the number of items in the array:

      array=String[3]        -- make an array of three Strings
      array[0]='String one'  -- set each array item
      array[1]='Another string'
      array[2]='foobar'
      loop i=0 to 2          -- display the items
        say array[i]
        end

This example also shows NetRexx line comments; the sequence ‘`--`’ (outside of literal strings or ‘`/*`’ comments) indicates that the remainder of the line is not part of the program and is commentary.

NetRexx makes it easy to initialize arrays: a term which is a list of one or more expressions, enclosed in brackets, defines an array. Each expression initializes an element of the array. For example:

      words=['Ogof', 'Ffynnon', 'Ddu']

would set `words` to refer to an array of three elements, each referring to a string. So, for example, the instruction:

      say words[1]

would then display `Ffynnon`.

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From The NetRexx Language by Mike Cowlishaw, mfc@uk.ibm.com (ISBN 0-13-806332-X, 197pp, Prentice-Hall, 1997).