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assocs.extras: adding deep-at.

db4
John Benediktsson 2012-05-14 17:04:52 -07:00
parent 6f5e1f16e0
commit 9230acbbb8
2 changed files with 9 additions and 0 deletions
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7
extra/assocs/extras/extras-tests.factor Normal file
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@ -0,0 +1,7 @@
USING: assocs.extras tools.test ;
IN: assocs.extras
{ f } [ H{ } { 1 2 3 } deep-at ] unit-test
{ 4 } [ H{ { 1 H{ { 2 H{ { 3 4 } } } } } } { 1 2 3 } deep-at ] unit-test

2
extra/assocs/extras/extras.factor
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@ -11,3 +11,5 @@ IN: assocs.extras
: assoc-sift ( assoc -- assoc' )
[ nip ] assoc-filter ; inline
: deep-at ( assoc seq -- value/f )
[ swap at ] each ;