From: Gary Wright <gwtmp01@...>
Date: 2008-12-20T15:00:31+09:00
Subject: [ruby-core:20714] Re: [Feature #905] Add String.new(fixnum) to preallocate large buffer


On Dec 19, 2008, at 5:28 PM, Charles Oliver Nutter wrote:
> I would also expect that the cost of allocating and populating an  
> arguments hash for this would negate some of the gain from adding  
> the new form. Array.buffer(100) adds almost no overhead on top of  
> the physical creation of the backing store and object to wrap it,  
> where Array.buffer(initial_size: 100) creates both a new Array and a  
> new Hash. An implementation detail, sure, but we I think we just  
> need something simple here. Perhaps buffer just doesn't express it  
> clearly enough?


How about:

String.reserve(100)
Array.reserve(100)

String.reserve(100, other_string)
Array.reserve(100, start_size, default_object)
Array.reserve(100, other_array)
Array.reserve(100, start_size) { # default block }