From: William Djaja Tjokroaminata <billtj@...>
Date: 2002-09-20T03:41:34+09:00
Subject: Re: select and select

Hi,

I do not like that the Array "at" method is overloaded.  I think currently
one advice in Ruby is to prefer "arr.at(i)" to "arr[i]" because in
"arr[i]" the intrepreter needs to check the type of i.  If Array "at" is
overloaded like below, probably the corresponding C function will be 
modified from

    static VALUE rb_ary_at (VALUE ary, VALUE pos)

to

    static VALUE rb_ary_at (VALUE self, VALUE args)

which means more overhead, as every time the Array "args" has to be
created, or to

    static VALUE rb_ary_at (int argc, VALUE *argv, VALUE self)
    {
        VALUE args;
        rb_scan_args (argc, argv, "0*", &args);
        ....

with the same effect.

Regards,

Bill
============================================================================
dblack@candle.superlink.net wrote:
>> |I think I would still like this better:
>> |
>> |  arr.at(0,2,4).select { |s| s == "c" }
>>
>> I admit this is better in some aspect.
>>
>> Does "at" takes multiple placement make you feel natural?
>> And is this natural for Hashes?

> For Arrays I do like at(x,y,z).  It seems natural to me.  For Hashes,
> I don't think I usually refer to a value as being "at" a key... but it
> sounds sort of right.