Thanks, It seems 18!:2 is more or less what I need. However, it gives an error for Boxed literals. I think I will need to wrap my verb in a try catch and if itcatches an error I know I am dealing with a standard J type.
You may be wondering why I would get myself intoa situation where I mistake a boxed literal for an object, but I am creating data structures thatare arrays of both Objects and standard J types. So I need to inspect each item in the structureto see if it is a boxed variable or an object. > Date: Thu, 30 Apr 2015 21:06:01 -0400 > From: [email protected] > To: [email protected] > Subject: Re: [Jprogramming] Datatype of an Object > > You could look at the path of the object, with > > 18!:2 Obj > > Since the path is under the control of the user, you would have to know > what you do with the path to be able to make sense of it. Often, the > first atom in the path would tell you what you are looking for. > > > > An object (called a 'numbered locale' in the J docs) is not a boxed > integer: it's a boxed string that contains all numberics. You could > check for that with > > isnumloc =: *./@:e.&'0123456789'@> > > Henry Rich > > (Note that it is an error for the first character of a numbered locale > to be '0'). > > > On 4/30/2015 8:57 PM, Jon Hough wrote: > > It seems of I have an Object,e.g.Obj =: conew 'MyClass' > > And later I want to get the type of Obj > > datatype Obj > > this returns "boxed", which is technically correct, but it seems datatype > > lacks the introspection to look beneath the box at the object. > > So is there a way to get the type (i.e. class name if possible) of an > > object? > > e.g. I have some variable Q (which happens to be an instance of MyClass).Is > > there a way to create a verb, getTypeOf, such that getTypeOf Q > > returns 'MyClass' > > I couldn't find anything in JForC on this. At the moment I am finding it > > difficult to differentiate boxedintegers from objects. > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
