Created
September 18, 2012 03:34
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A stupid-simple cross-product for collections
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| collections define: #CrossProduct &slots: {#rows -> #{}. #columns -> #{}}. | |
| c@(Collection traits) <*> d@(Collection traits) | |
| [ | |
| CrossProduct new `>> [rows := c. columns := d. ] | |
| ]. | |
| cross@(CrossProduct traits) do: block | |
| [ | |
| c do: [| :a | | |
| d do: [| :b | | |
| block apply*, a, b]] | |
| ]. |
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