How do I use customProperties

[Graham Samuel]

On Tue, 11 Feb 2003 16:45:16 +0000 I wrote:

>[...]


>The latest problem is that I want to do an existence
test for a particular custom property.

I finally answered my own question - one uses a global property, the 
customKeys, which gives a list of the custom properties of an object. 
Who would have guessed that properties are keys, eh? OK, I could have 
found it in the 'See Also' of the Transcript dictionary entry for 
'customProperties' but the name 'keys' put me off researching it. And 
anyway the info is very fragmented in the docs.

I am beginning to think that we (well, I) need a lot more short, 
concentrated essays explaining pretty well everything on specific 
topics - for example "all about custom properties" or "all about 
arrays" or "all about printing" etc. to include info on what not to 
do and gotchas. I realise that a lot of the info is there somewhere, 
but it's hard to get the right mixture of 'what' and 'how' to 
actually get things done. As soon as I feel I know enough about one 
of these areas I'll try to draft one of these notes - what do other 
people think?

Graham
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          Graham Samuel / The Living Fossil Co. / UK & France