From: "David A. Black" <dblack@...>
Date: 2007-08-24T20:09:28+09:00
Subject: Re: something I just found out, am sharing (:newbish)

Hi --

On Fri, 24 Aug 2007, Robert Dober wrote:

> On 8/24/07, Simon Schuster <significants@gmail.com> wrote:
>> 075:0> a = "hello"
>> "hello"
>> 076:0> a += " there."
>> "hello there."
>> 077:0>
>>
>>
>> neat!
> not really :(
> a += " there" is
> a = a + " there"
>
> a << " there"
>
> I might be accused of premature optimizationism (A word I just made
> up, I have to make an ECR ;).

Don't worry -- there's no Academie Anglaise :-)

> But seriously there is just no need to pay the cost of the
> construction of another String / Array.
> Performance difference is already enormous for moderately long strings :

It depends, though; sometimes you might want a copy, sometimes you
might definitely not. So the + vs. << decision may not be premature,
and the right decision may not even be the optimizing one :-)


David

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