Clarification

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Post #118,428 by drewk 9/22/03 10:37:14 AM Reply	Clarification I wasn't suggesting that ISA/HASA are the same thing. Quite the opposite: I think they are so fundamentally different that I don't understand having this distinction. It seems to me like having a special term to define the difference between variables and pancakes. They're just different things. Okay, I'm exaggerating. But are there people who know both of these methods that need it pointed out that they're different? === Implicitly condoning stupidity since 2001.
Post #118,500 by ben_tilly 9/22/03 10:04:26 PM Reply	Yes More specifically, I have seen people propose designs where people reach for is-a in lots of places where they really needed to reach for has-a. You can virtually see the lightbulb go off when you explain the difference and explain why they really need the other. The biggest contributing cause that I see for this are people who think that inheritance is good because it is OO and therefore they should use inheritance. But inheritance traditionally is an is-a relationship - that isn't the right hammer when you have a has-a relationship to model. Cheers, Ben "good ideas and bad code build communities, the other three combinations do not" - [link\|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html\|Stefano Mazzocchi]
Post #118,558 by drewk 9/23/03 10:51:27 AM Reply	That's why I shouldn't be a teacher There are some things that just seem so clear to me I don't even understand the question. It's like, "What part are you missing?" === Implicitly condoning stupidity since 2001.

Why extends is evil? - (johnu) - (44) - Aug. 4, 2003, 01:01:44 PM EDT

Is this just for Java? - (drewk) - Aug. 4, 2003, 01:08:47 PM EDT

This argument is needlessly pedantic, IMO - (FuManChu) - Aug. 4, 2003, 01:19:58 PM EDT

Lesson learned from Smalltalk - (ChrisR) - (1) - Aug. 4, 2003, 01:22:03 PM EDT

sounds like a will -NT - (deSitter) - Aug. 4, 2003, 02:43:03 PM EDT

Inheritance is a tool. - (admin) - (7) - Aug. 4, 2003, 02:30:40 PM EDT

Re: Inheritance is a tool. - (deSitter) - (3) - Aug. 4, 2003, 02:43:38 PM EDT

There's more to life than implementation inheritance. - (admin) - Aug. 4, 2003, 03:24:35 PM EDT

Definitions - (johnu) - (1) - Aug. 4, 2003, 03:24:52 PM EDT

I'd ask Alan Kay - (tuberculosis) - Aug. 21, 2007, 06:34:14 AM EDT

Thank you, Scott! - (jb4) - (1) - Aug. 4, 2003, 07:25:50 PM EDT

Another Me Too - (JimWeirich) - Aug. 4, 2003, 07:36:37 PM EDT

Good example of bad inheritance, java.util.Stack - (bluke) - Aug. 5, 2003, 08:14:25 AM EDT

This guy cracks me up - (tuberculosis) - Aug. 21, 2007, 06:34:08 AM EDT

IS A vs HAS A - (gdaustin) - (30) - Aug. 4, 2003, 10:30:10 PM EDT

Quite. - (static) - Aug. 5, 2003, 08:16:32 AM EDT

I missed that course - (drewk) - (18) - Aug. 5, 2003, 09:29:59 AM EDT

Shorthand for relationships - (admin) - (17) - Aug. 5, 2003, 09:36:46 AM EDT

Re: Shorthand for relationships - (deSitter) - (1) - Aug. 5, 2003, 09:40:20 AM EDT

snicker - (FuManChu) - Aug. 5, 2003, 10:51:07 AM EDT

ISA/HASA are good for a first approximation - (JimWeirich) - (14) - Aug. 5, 2003, 10:02:12 AM EDT

So what does it get you? - (drewk) - (10) - Aug. 5, 2003, 10:07:20 AM EDT

Specialization vs. Generalization - (gdaustin) - Aug. 5, 2003, 10:25:51 AM EDT

Code - (JimWeirich) - (7) - Aug. 5, 2003, 10:59:43 AM EDT

Thanks, but what would HASA look like? -NT - (drewk) - (6) - Aug. 5, 2003, 11:22:29 AM EDT

HASA - (gdaustin) - (5) - Aug. 5, 2003, 05:31:03 PM EDT

See, that's where I always get tripped up - (drewk) - (4) - Aug. 5, 2003, 05:53:29 PM EDT

There is a point to naming the useless stuff - (ben_tilly) - (3) - Sept. 21, 2003, 05:36:50 PM EDT

Clarification - (drewk) - (2) - Sept. 22, 2003, 10:37:14 AM EDT

Yes - (ben_tilly) - (1) - Sept. 22, 2003, 10:04:26 PM EDT

That's why I shouldn't be a teacher - (drewk) - Sept. 23, 2003, 10:51:27 AM EDT

The example of a stack (see post above) is a good one - (bluke) - Aug. 5, 2003, 11:47:35 AM EDT

My car is a Saturn - (gdaustin) - Aug. 5, 2003, 10:31:43 AM EDT

hierarchies and the real world - (tablizer) - (1) - Aug. 9, 2003, 02:07:51 PM EDT

Nonsense - (ChrisR) - Aug. 9, 2003, 03:51:57 PM EDT

Not quite that simple - (tuberculosis) - (9) - Aug. 21, 2007, 06:36:01 AM EDT

Thing I love/hate about smalltalk - (drewk) - (2) - Aug. 5, 2003, 12:26:10 PM EDT

Similar to Python in that fashion -NT - (admin) - Aug. 5, 2003, 12:41:34 PM EDT

Its real -NT - (tuberculosis) - Aug. 21, 2007, 06:36:13 AM EDT

Forgot to mention: key driver is "substitutability" - (tuberculosis) - (4) - Aug. 21, 2007, 06:36:18 AM EDT

Techies at Hertz - (tablizer) - (3) - Aug. 9, 2003, 02:12:31 PM EDT

And if your Table or Data Structure is... - (ChrisR) - Aug. 9, 2003, 03:53:19 PM EDT

Mostly - (tuberculosis) - (1) - Aug. 21, 2007, 12:45:06 PM EDT

Or perhaps that .... - (gdaustin) - Aug. 11, 2003, 12:03:54 AM EDT

Code sharing vs. polymorphism - (johnu) - Aug. 5, 2003, 04:42:32 PM EDT

Hey, they have color-coded detours here.
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