Data commit

Task/Call-a-function/Icon/call-a-function.icon

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+procedure main()  # demonstrate and describe function calling syntax and semantics
+
+   # normal procedure/function calling
+
+   f()                      # no arguments, also command context
+   f(x)                     # fixed number of arguments
+   f(x,h,w)                 # variable number of arguments (varargs)
+   y := f(x)                # Obtaining the returned value of a function
+
+   # procedures as first class values and string invocation
+
+   f!L                      # Alternate calling syntax using a list as args
+   (if \x then f else g)()  # call (f or g)()
+   f := write               # assign a procedure
+   f("Write is now called") # ... and call it
+   "f"()                    # string invocation, procedure
+   "-"(1)                   # string invocation, operator
+
+   # Co-expressions
+
+   f{e1,e2}                 # parallel evaluation co-expression call
+                            # equivalent to f([create e1, create e2])
+   expr @ coexp             # transmission of a single value to a coexpression
+   [e1,e2]@coexp            # ... of multiple values (list) to a coexpression
+   coexp(e1,e2)             # ... same as above but only in Unicon
+
+   # Other
+
+   f("x:=",1,"y:=",2)       # named parameters (user defined)
+end