From: Dave Bass <davebass@...>
Date: 2008-07-27T19:21:49+09:00
Subject: Re: Interesting Array Initialization Typo

Regarding typos: Ruby can't be expected to know what you meant to type, 
so if it's syntactically correct it will let it through -- as with any 
language! To do otherwise would be as annoying as Microsoft's Clippy: "I 
see you're trying to set up an array. Did you just make a typo? <wink>"

Shadowfirebird wrote:
> a = []
> a << [1,2]
> a << [2,3]
> a << [3,4]

Without any actual understanding of what's going on inside Ruby 
(sorry!), I suspect this code will be slower, as the array has to be 
grown three times, rather than springing into existence fully 
initialised. Or is this a negligible overhead? Or does the code get 
optimised by the compiler/interpreter? Maybe someone knowledgeable would 
like to comment.

In particular it would be interesting to know if putting array pushes, 
pops, shifts and unshifts inside a big loop is inefficient.

Dave
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