tasks a-s

Task/Partial-function-application/Icon/partial-function-application.icon

@@ -0,0 +1,39 @@
+link printf
+
+procedure main()
+   fsf1 := partial(fs,f1)
+   fsf2 := partial(fs,f2)
+   every s :=  [ 0, 1, 2, 3 ] |
+               [ 2, 4, 6, 8 ] do {
+         printf("\ns       := %s\n",list2string(s))
+         printf("fsf1(s) := %s\n",list2string(fsf1(s)))
+         printf("fsf2(s) := %s\n",list2string(fsf2(s)))
+      }
+end
+
+procedure partial(f,g)  #: partial application of f & g
+   @( p := create repeat {
+                  s := (r@&source)[1]  # return r / get argument s
+                  r := f(g,s)          # apply f(g,...)
+                  }
+      )                                # create and activate procedure p
+   return p
+end
+
+procedure fs(f,s)       #: return list where f is applied to each element of s
+   every put(r := [], f(!s))
+   return r
+end
+
+procedure f1(n)         # double
+   return n * 2
+end
+
+procedure f2(n)         #: square
+   return n ^ 2
+end
+
+procedure list2string(L)         #: format list as a string
+   every (s := "[ ") ||:= !L || " "
+   return s || "]"
+end