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A comment on J Source to be released under GPL. Parent comment

Re:J Source to be released under GPL by limmeau on Wednesday March 02, 2011 @03:15AM (#2278849)
I glanced over the J for C table of contents to find out where J keeps anything like product and sum types, but I found no promising headlines. Is that just J's way of saying "if it's not a matrix, don't use J", or am I missing something fundamental here?
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Re:J Source to be released under GPL by silentbicycle on Wednesday March 02, 2011 @08:09AM (#2279399)
Box/open are the primitives you want. Box wraps other values (possibly with different types or sizes) in one array, kind of like a C struct. Open extracts sub-elements.

Box: http://www.jsoftware.com/help/dictionary/d010.htm

Open: http://www.jsoftware.com/help/dictionary/d020.htm

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