Hi to all!
While writing my little factor programs, I often find a situation in
which I have an object,
I test it and if test is ok then some action is performed on it, else it
is simply dropped.
Ex.: (obj on top of stack)
dup test-condition [ do something with obj ] [ drop ] if
I think this would be better expressed this way: (always with obj on top
of stack)
[ do-test ] [ do-action-on-obj ] when-drop
To achieve this, I wrote this word:
: when-drop ( obj question-quot: ( obj -- ? ) true-quot: ( obj -- ) -- )
-rot dupd call swapd [ call ] [ 2drop ] if ; inline
But documentation claims that swapd and dupd are deprecated, and suggest
to use lexical variables.
So I rewrote this way:
:: when-drop ( obj question-quot: ( ..obj -- ? ) true-quot: ( ..obj -- )
-- )
obj dup question-quot call [ true-quot call ] [ drop ] if ; inline
Is this useless/redundant or do you think this can be interesting?
thank you all,
michele pes
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