411 REFERENCE · Wikibooks
Rebol Programming/collect
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USAGE:
COLLECT body /into output
DESCRIPTION:
Evaluates a block, storing values via KEEP function, and returns block of collected values.
COLLECT is a function value.
ARGUMENTS
body -- Block to evaluate (Type: block)
REFINEMENTS
/into -- Insert into a buffer instead (returns position after insert)
output -- The buffer series (modified) (Type: series)
SOURCE CODE
collect: func [
{Evaluates a block, storing values via KEEP function, and returns block of collected values.}
body [block!] "Block to evaluate"
/into {Insert into a buffer instead (returns position after insert)}
output [series!] "The buffer series (modified)"
][
unless output [output: make block! 16]
do make function! [keep] copy/deep body make function! [value /only] copy/deep [
output: either only [insert/only output :value] [insert output :value]
:value
]
either into [output] [head output]
]