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curryingshen

Shen and curried S-expressions

Are functions in Shen uniadic or variadic? Is (+ 1 2 3) in Shen shorthand for (+ 1 (+ 2 3))? I am curious about currying in Shen, and how it works together with S-expressions.

edit After I have played around with the REPL, I believe functions are uniadic. I am impressed by the pattern matching, but can not understand how to write a function that behaves as + if I call it with more than two operands.

Solution

  • Functions arent variadic, but some macros are.

    (0-) (and true true true)
true

(1-) (macroexpand [and true true true])
[and true [and true true]]

(2-) (macroexpand [+ 1 2 3])
[+ 1 [+ 2 3]]

    See defmacro for creating new ones:

    http://www.shenlanguage.org/learn-shen/macros.html