Thanks, Doug!
That's really elegant. This sort of thing is why I'm switching from
Common Lisp to Factor.
Larry
On Tue, Aug 16, 2011 at 8:01 PM, Doug Coleman <doug.cole...@gmail.com> wrote:
> You can do something like this:
>
> : stats>item-info ( stats -- item-info)
> { 0 1 3 } swap nths \ item-info slots>tuple ;
>
> Doug
>
> On Tue, Aug 16, 2011 at 4:57 PM, Larry Coleman
> <all.are.wond...@gmail.com> wrote:
>> This works, but I'm pretty sure it's not idiomatic factor, and I'll
>> need to do something similar at least twice more, so there must be a
>> better way:
>>
>> TUPLE: item-info longitude latitude speed ;
>>
>> C: <item-info> item-info
>>
>> : stats>item-info ( stats -- item-info )
>> {
>> [ 0 swap nth ]
>> [ 1 swap nth ]
>> [ 3 swap nth ]
>> } cleave <item-info> ;
>>
>> So what is the idiomatic way to get a items out of an array based on a
>> sequence of indexes?
>>
>> Thanks in advance,
>>
>> Larry Coleman
>>
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