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Re: code snippet [message #25295 is a reply to message #25294]

Tue, 29 May 2001 14:21

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

Hi,

Ken Mankoff wrote...

> Hi everyone,
>
> i just ran across this in an IDL (its inside 'map_continents.pro')
> procedure, and thought its behaviour was pretty neat. [...]
>
> IDL> key = 2
> IDL> ;;; set 'key' to 0 or 1 or 2 or ...
> IDL> possibilities = ['first','second','third','fourth']
> IDL> choice = (possibilities)[key]
> IDL> help, choice
> CHOICE STRING = 'third'

Perhaps less neat is the (equivalent) simple array access:

choice = (possibilities)[key]

But neater still is subscripting an array built on-the-spot
(again equivalent to the original):

choice = (['first','second','third','fourth'])[key]

Note that all parentheses and brackets are required here.

Cheers,
--
-Dick

Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392

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[Message index]

		Re: code snippet By: Brian Jackel on Wed, 30 May 2001 09:26
		Re: code snippet By: m.hadfield on Tue, 29 May 2001 17:38
		Re: code snippet By: Craig Markwardt on Tue, 29 May 2001 15:03
		Re: code snippet By: Dick Jackson on Tue, 29 May 2001 14:21

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