isKindOf

[thor-2]

Hi list

Why is it that when I run the latter line many times I sometimes get false and

sometimes true?

I'd think it should always be true, no?

a = List.new

a.isKindOf("SCWindow")

[James Harkins-2]

On Wed, Jul 16, 2008 at 5:20 PM, thor <th.list@...> wrote:
> Hi list
> Why is it that when I run the latter line many times I sometimes get false
> and
> sometimes true?
> I'd think it should always be true, no?
> a = List.new
> a.isKindOf("SCWindow")

Bizarre... actually I think it should throw an error in this case.
isKindOf expects a Class as the argument, not a string.

a.isKindOf(SCWindow) should always be false (if a is a List).

a.isKindOf('SCWindow') properly throws a "wrong type" error.

a.isKindOf("SCWindow") should likewise fail but it goes through and
returns garbage.

BTW, did you notice that this also returns false (most of the time)?

a = List.new;
a.isKindOf("List");

hjh


--
James Harkins /// dewdrop world
jamshark70@...
http://www.dewdrop-world.net

"Come said the Muse,
Sing me a song no poet has yet chanted,
Sing me the universal." -- Whitman

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[thor-2]

Ha!

Sorry, I pasted the upper line after testing with List as well.

Obviously I didn't want to check if a List was a SCWindow.

But that made it even more bizarre as you say : )

This sometimes returns true:

a = List.new

a.isKindOf("Top 10 Best Seller List")

So basically my mistake was to put in a string.

thanks James, problem solved in my patch, but something smelly is going

on in the primitive perhaps?

On 16 Jul 2008, at 22:26, James Harkins wrote:

On Wed, Jul 16, 2008 at 5:20 PM, thor <th.list@...> wrote:

Hi list

Why is it that when I run the latter line many times I sometimes get false

and

sometimes true?

I'd think it should always be true, no?

a = List.new

a.isKindOf("SCWindow")

Bizarre... actually I think it should throw an error in this case.

isKindOf expects a Class as the argument, not a string.

a.isKindOf(SCWindow) should always be false (if a is a List).

a.isKindOf('SCWindow') properly throws a "wrong type" error.

a.isKindOf("SCWindow") should likewise fail but it goes through and

returns garbage.

BTW, did you notice that this also returns false (most of the time)?

a = List.new;

a.isKindOf("List");

hjh

-- 

James Harkins /// dewdrop world

jamshark70@...

http://www.dewdrop-world.net

"Come said the Muse,

Sing me a song no poet has yet chanted,

Sing me the universal." -- Whitman

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sc-users mailing list

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search: http://www.listarc.bham.ac.uk/lists/sc-users/search/