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sequences.extras: adding map-filter.

db4
John Benediktsson 2012-04-25 15:50:35 -07:00
parent 61b3c26e1b
commit 9bc6e29506
2 changed files with 10 additions and 0 deletions
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4
extra/sequences/extras/extras-tests.factor
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@ -59,3 +59,7 @@ IN: sequences.extras.tests
{ V{ 0 0 1 0 1 2 } } [ 4 iota [ iota ] map-concat ] unit-test
{ "abc" } [ "abc" [ 1string ] map-concat ] unit-test
{ { 97 98 99 } } [ "abc" [ 1string ] { } map-concat-as ] unit-test
{ { } } [ { } [ ] [ even? ] map-filter ] unit-test
{ "bcde" } [ "abcd" [ 1 + ] [ drop t ] map-filter ] unit-test
{ { 0 4 16 36 64 } } [ 10 iota [ sq ] [ even? ] { } map-filter-as ] unit-test

6
extra/sequences/extras/extras.factor
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@ -127,3 +127,9 @@ IN: sequences.extras
: map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
over map-concat-as ; inline
: map-filter-as ( ... seq quot: ( ... elt -- ... newelt ) quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
dup [ selector-for [ compose each ] dip ] curry dip like ; inline
: map-filter ( ... seq quot: ( ... elt -- ... newelt ) quot: ( ... newelt -- ... ? ) -- ... subseq )
pick map-filter-as ; inline