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September Morn Update

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Ingy döt Net 2019-09-12 10:33:56 -07:00
parent 4e2d22a71d
commit aac6731f2c
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Task/Generator-Exponential/Factor/generator-exponential.factor Normal file
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USING: fry kernel lists lists.lazy math math.functions
prettyprint ;
IN: rosetta-code.generator-exponential
: mth-powers-generator ( m -- lazy-list )
[ 0 lfrom ] dip [ ^ ] curry lmap-lazy ;
: lmember? ( elt list -- ? )
over '[ unswons dup _ >= ] [ drop ] until nip = ;
: 2-not-3-generator ( -- lazy-list )
2 mth-powers-generator
[ 3 mth-powers-generator lmember? not ] <lazy-filter> ;
10 2-not-3-generator 20 [ cdr ] times ltake list>array .