factor-talk

On Jun 15, 2009, at 4:12 PM, Charles Turner wrote:

> In my particular use, I >AM< creating multi-dimensional array
> constants for later use, so I think the literal vocabulary would be
> appropriate.
>
> I suppose I could include more of the code that generates the two
> source arrays, but it does bring up the question of how to accomplish
> this by other means. Time to go back and re-read the vocabulary  
> pages...

Like you said, you'd need to put all the operands inside your $[ ]  
block to use literals:

CONSTANT: heads $[ { { 1 2 3 } { 1 2 3 } { 1 2 3 } } { 3 2 1 }  
[ head ] 2map ]

The $[ ] syntax kinda sucks for complex expressions like this. You  
might be better served by using MEMO: words and factoring out the  
simpler components from which you're building your complex constants.  
With no parameters, a MEMO: word will run only the first time it's  
called and cache the result:

CONSTANT: bodies { { 1 2 3 } { 1 2 3 } { 1 2 3 } }
CONSTANT: head-sizes { 3 2 1 }
MEMO: heads ( -- x ) bodies head-sizes [ head ] 2map ;

-Joe

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