Re: [svn:perl6-synopsis] r13567 - doc/trunk/design/syn

[Dr.Ruud]

Larry Wall schreef:
> Dr.Ruud wrote:

>> I would expect
>>
>>   %hash.exists{$key}
>
> Except $foo.bar{$key} is interpreted as $foo.bar().{$key}.  Things
> like "exists" and "delete" need to evaluate the key before calling
> the method in question, not after.

OK.

>> with the shortcut
>>
>>   %hash.:{$key}
>>
>> to test (at run-time) for existance of the element, and expect
>>
>>   %hash.:exists
>>
>> to test (at compile time if possible) for the validity of 'exists',
>> more like
>>
>>   %hash.can('exists');
>>
>>   %hash.has('exists');
>>
>>   %hash.does('exists');
>
> Why would you expect colon to do that?  I don't see the prior art...

I was reading : as TEST (or indeed STATUS, or even STATE), and read the
part ":exists" a "the STATUS (or validity) of exists()", which would
always be true (or >0) because exists() is in the "hash-core".

So "%table.:$key" or "%table.:{$key}" would then be short for
"%table.exists{key}" (assuming exists() to be the default
TEST/STATUS/STATE-method for hash).

-- 
Affijn, Ruud

"Gewoon is een tijger."

Re: [svn:perl6-synopsis] r13567 - doc/trunk/design/syn

[Larry Wall]

On Fri, Feb 02, 2007 at 08:14:53PM +0100, Dr.Ruud wrote:
: I would expect
: 
:   %hash.exists{$key}
: 

Except $foo.bar{$key} is interpreted as $foo.bar().{$key}.  Things like
"exists" and "delete" need to evaluate the key before calling the method
in question, not after.

: with the shortcut
: 
:   %hash.:{$key}
: 
: to test (at run-time) for existance of the element, and expect
: 
:   %hash.:exists
: 
: to test (at compile time if possible) for the validity of 'exists', more
: like
: 
:   %hash.can('exists');
: 
:   %hash.has('exists');
: 
:   %hash.does('exists');

Why would you expect colon to do that?  I don't see the prior art...

Larry

Re: [svn:perl6-synopsis] r13567 - doc/trunk/design/syn

[Dr.Ruud]

[EMAIL PROTECTED] schreef:

> Just glad someone's reading these things...

Of course we are. But it is hard to react when the syntax isn't in your
muscle memory yet.

>From r13565:

> +%hash.:exists{$key}


I would expect

  %hash.exists{$key}

with the shortcut

  %hash.:{$key}

to test (at run-time) for existance of the element, and expect

  %hash.:exists

to test (at compile time if possible) for the validity of 'exists', more
like

  %hash.can('exists');

  %hash.has('exists');

  %hash.does('exists');

-- 
Affijn, Ruud

"Gewoon is een tijger."