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June 2018 Update

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Ingy döt Net 2018-06-22 20:57:24 +00:00
parent ba8067c3b7
commit 22f33d4004
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Task/Self-describing-numbers/Factor/self-describing-numbers.factor Normal file
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USING: kernel math.parser prettyprint sequences ;
IN: rosetta-code.self-describing-numbers
: digits ( n -- seq ) number>string string>digits ;
: digit-count ( seq n -- m ) [ = ] curry count ;
: self-describing-number? ( n -- ? )
digits dup [ digit-count = ] with map-index [ t = ] all? ;
100,000,000 <iota> [ self-describing-number? ] filter .