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sequences.extras: Add first=, first?, etc

db4
Doug Coleman 2012-09-10 12:10:33 -07:00
parent 3014b1828a
commit 1bd36d5991
2 changed files with 28 additions and 0 deletions
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14
extra/sequences/extras/extras-tests.factor
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@ -123,3 +123,17 @@ IN: sequences.extras.tests
{ 1 } [ { 1 7 3 7 6 3 7 } arg-max ] unit-test
{ 0 } [ { 1 7 3 7 6 3 7 } arg-min ] unit-test
{ t } [ { 1 2 3 4 5 } 1 first= ] unit-test
{ t } [ { 1 2 3 4 5 } 2 second= ] unit-test
{ t } [ { 1 2 3 4 5 } 3 third= ] unit-test
{ t } [ { 1 2 3 4 5 } 4 fourth= ] unit-test
{ t } [ { 1 2 3 4 5 } 5 last= ] unit-test
{ t } [ 4 { 1 2 3 4 5 } 5 nth= ] unit-test
{ t } [ { 1 2 3 4 5 } [ 1 = ] first? ] unit-test
{ t } [ { 1 2 3 4 5 } [ 2 = ] second? ] unit-test
{ t } [ { 1 2 3 4 5 } [ 3 = ] third? ] unit-test
{ t } [ { 1 2 3 4 5 } [ 4 = ] fourth? ] unit-test
{ t } [ { 1 2 3 4 5 } [ 5 = ] last? ] unit-test
{ t } [ 4 { 1 2 3 4 5 } [ 5 = ] nth? ] unit-test

14
extra/sequences/extras/extras.factor
View File

@ -294,3 +294,17 @@ INSTANCE: odds immutable-sequence
: arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
[ dup length iota zip ] dip
[ first-unsafe ] prepose filter values ; inline
: first= ( seq elt -- ? ) [ first ] dip = ; inline
: second= ( seq elt -- ? ) [ second ] dip = ; inline
: third= ( seq elt -- ? ) [ third ] dip = ; inline
: fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
: last= ( seq elt -- ? ) [ last ] dip = ; inline
: nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
: first? ( seq quot -- ? ) [ first ] dip call ; inline
: second? ( seq quot -- ? ) [ second ] dip call ; inline
: third? ( seq quot -- ? ) [ third ] dip call ; inline
: fourth? ( seq quot -- ? ) [ fourth ] dip call ; inline
: last? ( seq quot -- ? ) [ last ] dip call ; inline
: nth? ( n seq quot -- ? ) [ nth ] dip call ; inline