Commits on Nov 16, 2016

1. Add `-npartial' for arbitrary partial application …

   Currently, we have `-partial' and `-rpartial' for currying with
   arguments at either the left or the right.
   
   `-npartial' is a generalisation of `-partial' and `-rpartial'. It takes
   an offset N to determine where to put the curried arguments, a function
   FN, and the partially applied ARGS.
   
   ARGS will be spliced in after the Nth element in the additional args. If
   N is negative, -1 is taken to be the final item, -2, the penultimate
   item, etc.
   
   This function satisfies the following laws:
   
     (-npartial 0 ...) ≡ (-partial ...)
     (-npartial -1 ...) ≡ (-rpartial ...)"
   
   E.g.:
     (funcall (-npartial 1 (lambda (a b c) (+ a (* b c))) 5)
         2 3) ;; => 17
     (funcall (-npartial 2 (lambda (a b c d) (+ a (* b c) d)) 3)
         2 4 5) ;; => 19
     (funcall (-npartial -1 #'concat "last " "words.")
         "These " "are " "the ") ;; => "These are the last words."
     (funcall (-npartial 3 (lambda (a b c d e f) (concat a b c d e f "."))
                         "penultimate " "words ")
         "I'll " "put " "the " "here")
     ;; => "I'll put the penultimate words here."

   

   daantjie committed Nov 16, 2016
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