38 lines
806 B
Plaintext
38 lines
806 B
Plaintext
; by @Krenium
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table: [
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[0 3 1 7 5 9 8 6 4 2]
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[7 0 9 2 1 5 4 8 6 3]
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[4 2 0 6 8 7 1 3 5 9]
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[1 7 5 0 9 8 3 4 2 6]
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[6 1 2 3 0 4 5 9 7 8]
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[3 6 7 4 2 0 9 5 8 1]
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[5 8 6 9 7 2 0 1 3 4]
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[8 9 4 5 3 6 2 0 1 7]
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[9 4 3 8 6 1 7 2 0 5]
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[2 5 8 1 4 3 6 7 9 0]
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]
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damm?: function [z][zero? fold digits to :integer z .seed: 0 [x y]-> table\[x]\[y] ]
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; Or, being more explicit:
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digits2: function [str][
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chars: split str
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result: map chars 'ch -> to :integer ch
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return result
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]
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damm2?: function [str][
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d: digits2 str
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r: fold d .seed: 0 [x y] -> get get table x y
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return r = 0
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]
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test: function [str][
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result: switch damm? str -> "valid"
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-> "invalid"
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print [str "is" result]
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]
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loop ["5724" "5727" "112946" "112949"] => test
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