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Re: code snippet
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.
Dick Jackson / firstname.lastname@example.org
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392