: map-from ( ... seq quot: ( ... elt -- ... newelt ) i -- ... newseq )
pick map-from-as ; inline
+: map-if ( ... seq if-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
+ '[ dup @ _ when ] map ; inline
+
<PRIVATE
: push-map-if ( ..a elt filter-quot: ( ..a elt -- ..b ? ) map-quot: ( ..a elt -- ..b newelt ) accum -- ..b )
: >string-list ( seq -- seq' )
[ "\"" 1surround ] map "," join ;
+: with-string-lines ( str quot -- str' )
+ [ string-lines ] dip map "\n" join ; inline
+
+: prepend-lines-with-spaces ( str -- str' )
+ [ " " prepend ] with-string-lines ;
+
: one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
[ find ] 2keep rot [
[ 1 + ] 2dip find-from drop not
] if-empty ;
: change-last ( seq quot -- )
- [ drop length 1 - ] [ change-nth ] 2bi ; inline
+ [ index-of-last ] [ change-nth ] bi* ; inline
: change-last-unsafe ( seq quot -- )
- [ drop length 1 - ] [ change-nth-unsafe ] 2bi ; inline
+ [ index-of-last ] [ change-nth-unsafe ] bi* ; inline
: replicate-into ( ... seq quot: ( ... -- ... newelt ) -- ... )
over [ length ] 2dip '[ _ dip _ set-nth-unsafe ] each-integer ; inline
zero? [ 1 + ] unless ; inline
INSTANCE: step-slice virtual-sequence
+
+: 2nested-each ( seq1 seq2 quot -- )
+ swapd '[
+ swap _ with each
+ ] with each ; inline
+
+: 3nested-each ( seq1 seq2 seq3 quot -- )
+ [ spin ] dip '[
+ -rot [
+ swap _ with with each
+ ] with with each
+ ] with with each ; inline
+
+: 2nested-map ( seq1 seq2 quot -- seq )
+ 2over [ length ] bi@ * reach
+ [
+ new-resizable
+ [ [ push ] curry compose 2nested-each ] keep
+ ] keep like ; inline
+
+: 3nested-map ( seq1 seq2 seq3 quot -- seq )
+ 3 nover [ length ] tri@ * * 5 npick
+ [
+ new-resizable
+ [ [ push ] curry compose 3nested-each ] keep
+ ] keep like ; inline
+
+: each-prior ( ... seq quot: ( ... prior elt -- ... ) -- ... )
+ '[ [ swap @ ] keep ]
+ sequence-operator 0 -rot each-integer-from drop ; inline
+
+: map-prior-as ( ... seq quot: ( ... prior elt -- elt' ) exemplar -- seq' )
+ [
+ '[ [ swap @ ] keep swap ] length-operator 0 -rot
+ ] dip map-integers-as nip ; inline
+
+: map-prior ( ... seq quot: ( ... prior elt -- elt' ) -- seq' )
+ over map-prior-as ; inline
+
+TUPLE: virtual-zip-index seq ;
+
+C: <zip-index> virtual-zip-index
+
+M: virtual-zip-index length seq>> length ; inline
+
+M: virtual-zip-index nth-unsafe
+ over [ seq>> nth-unsafe ] [ 2array ] bi* ; inline
+
+INSTANCE: virtual-zip-index immutable-sequence