[REBOL] Re: getting rid of empty string in a block.
From: greggirwin:mindspring at: 13-Mar-2002 11:27
Hi Stephane,
<< What would be the best solution to get rid of the empty strings ? (or of
any
empty values of a block, be they string or of any type? Could you give me a
pointer to the explanation of this in the official doc ? >>
I don't know if this is the best solution, but it's nice and general:
remove-if: func [predicate blk args /local result keep-it][
result: make block! length? blk
repeat el blk [
; Have to use a temp variable here. "if" doesn't like "predicate :el
args"
; inline and putting it in parens breaks the evaluation.
keep-it: not predicate :el args
if keep-it [append/only result :el]
]
return result
]
>> remove-if :empty? ["" "A" "B" "" "C" "D" ""] none
== ["A" "B" "C" "D"]
--Gregg
