Re: string.len(str) vs str:len()

[Mason Mackaman <masondeanm@...>]

Also doesn’t there have to be some emphasis on the locality (can I say that?) of getmetatable(‘’).__index, otherwise it wouldn’t be any faster? 
On Aug 7, 2014, at 12:42 PM, Elias Barrionovo <elias.tandel@gmail.com> wrote:

> On Thu, Aug 7, 2014 at 2:35 PM, Mason Mackaman <masondeanm@aol.com> wrote:
>> So does some equivalent of "local getmetatable('').__index=_ENV.string” execute before the program starts?
> 
> 
> Yes! More like `setmetatable("", {__index = string})`, actually:
> http://www.lua.org/source/5.2/lstrlib.c.html#createmetatable
> 
> Just one more example of how Lua doesn't care about string when using __index:
> 
> Lua 5.2.3  Copyright (C) 1994-2013 Lua.org, PUC-Rio
>> str = "hello"
>> print(str:len())
> 5
>> string = nil
>> print(string.len(str))  -- no more string, so blows up
> stdin:1: attempt to index global 'string' (a nil value)
> stack traceback:
>    stdin:1: in main chunk
>    [C]: in ?
>> print(str:len())  -- __index remains untouched
> 5
> 
> 
> -- 
> NI!
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