Comments on: User Defined Types http://www.dailydoseofexcel.com/archives/2004/07/15/user-defined-types/ Daily posts of Excel tips…and other stuff Mon, 06 Feb 2012 18:39:56 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Dick http://www.dailydoseofexcel.com/archives/2004/07/15/user-defined-types/#comment-1969 Dick Fri, 16 Jul 2004 15:08:00 +0000 http://www.dailydoseofexcel.com/?p=685#comment-1969 <p>I use UDTs when I can simply replace them with variables, like the example. Anything more complicated than that, and I use a class. For instance, if I have a variable that I need to split out, e.g. a playing card - I may want the suit or the number separately, so I'll use a class with Let/Get Value (10S) and Get only suit (S) and number (10) properties. So it doesn't take much complexity for me to go to a class over a UDT. The other situation is if I have to manipulate a lot of properties/variables at once. I use a class so I can have a method that does all that work.</p> <p>In practice, I usually start with a bunch of variables. The I find myself passing those variables between subs and think "How about a UDT". Once I have the UDT I start seeing the benefits of having a class. So it's kind of an evolutionary process for me. I really should consider classes first, but I don't.</p> <p>And I agree that they're more fun.</p> I use UDTs when I can simply replace them with variables, like the example. Anything more complicated than that, and I use a class. For instance, if I have a variable that I need to split out, e.g. a playing card – I may want the suit or the number separately, so I’ll use a class with Let/Get Value (10S) and Get only suit (S) and number (10) properties. So it doesn’t take much complexity for me to go to a class over a UDT. The other situation is if I have to manipulate a lot of properties/variables at once. I use a class so I can have a method that does all that work.

In practice, I usually start with a bunch of variables. The I find myself passing those variables between subs and think “How about a UDT”. Once I have the UDT I start seeing the benefits of having a class. So it’s kind of an evolutionary process for me. I really should consider classes first, but I don’t.

And I agree that they’re more fun.

]]> By: Jamie Collins http://www.dailydoseofexcel.com/archives/2004/07/15/user-defined-types/#comment-1968 Jamie Collins Fri, 16 Jul 2004 13:34:00 +0000 http://www.dailydoseofexcel.com/?p=685#comment-1968 <p>When would you use a struct (Type) and when to use a class? I almost always use classes because they are more fun . There have been a few posts in the ngs recently which have put me off Types even more e.g. can't add them to a Collection, can't be used for return types for functions in class modules, etc.</p> <p>Jamie.</p> <p>–</p> When would you use a struct (Type) and when to use a class? I almost always use classes because they are more fun . There have been a few posts in the ngs recently which have put me off Types even more e.g. can’t add them to a Collection, can’t be used for return types for functions in class modules, etc.

Jamie.

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