sequences.extras: simpler round-robin.
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@ -72,4 +72,5 @@ IN: sequences.extras.tests
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{ 8 } [ 3 iota dup [ 1 + * ] 2map-sum ] unit-test
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{ 4 } [ "hello" "jello" [ = ] 2count ] unit-test
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{ "ADEBFC" } [ { "ABC" "D" "EF" } round-robin ] unit-test
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{ { } } [ { } round-robin ] unit-test
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{ "ADEBFC" } [ { "ABC" "D" "EF" } round-robin >string ] unit-test
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@ -184,15 +184,12 @@ PRIVATE>
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: 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
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[ 1 0 ? ] compose 2map-sum ; inline
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:: round-robin-as ( seqs exemplar -- newseq )
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seqs length :> len
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0 0 seqs sum-lengths [
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f [
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drop dup len >= [ drop 1 + 0 ] when
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2dup seqs nth-unsafe ?nth
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[ 1 + ] [ dup not ] bi*
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] loop
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] exemplar replicate-as 2nip ;
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: max-lengths ( seq -- n )
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[ length ] [ max ] map-reduce ;
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: round-robin ( seqs -- newseq )
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[ { } ] [ dup first round-robin-as ] if-empty ;
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: round-robin ( seq -- newseq )
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[ { } ] [
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dup [ max-lengths ] [ length ] bi [ iota ] bi@
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[ [ 2array ] with map ] curry map concat swap
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[ [ first2 ] dip nth-unsafe ?nth ] curry map sift
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] if-empty ;
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