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

[Elias Barrionovo <elias.tandel@...>]

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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