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[REBOL] Re: To-pair vs as-pair

From: anton:lexicon at: 2-Jan-2003 11:24

Yes, as-pair is quite useful. Keep in mind that if you use these functions in a tight loop that draws some graphics, for example, you can get some speed by gutting the functions. Let's look at the sources:
>> ?? as-pair
as-pair: func [ "Combine X and Y values into a pair." x [number!] y [number!] ][ to-pair reduce [to-integer x to-integer y] ]
>> ?? to-pair
to-pair: func ["Converts to pair value." value "Value to convert"][to pair! :value] You can see that as-pair makes three mezzanine function calls. This will slow you down in a tight loop, so instead, you could just do everything yourself: to pair! reduce [to integer! x to integer! y] That will be much faster. (And also backwards compatible to last full version of view 1.2.1) Anton.