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First-class functions: Difference between revisions
→Tacit (unorthodox) version
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===Tacit (unorthodox) version===
In J only adverbs and conjunctions (functionals) can produce verbs (functions)... Unless they are forced to cloak as verbs (functions). (Note that this takes advantage of a bug/feature of the interpreter ; see [http://rosettacode.org/wiki/Closures/Value_capture#Tacit_.28unorthodox.29_version unorthodox tacit] .) The resulting functions (which correspond to functionals) can take and produce functions:
<lang j> train =. (<'`:')(0:`)(,^:)&6 NB. Producing the function train corresponding to the functional `:6
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