Re: Most awesome string metatable hack

[Rena <hyperhacker@...>]

On Fri, Jan 31, 2014 at 12:30 PM, Elias Barrionovo <elias.tandel@gmail.com> wrote:

Since we're talking 'bout cool metatricks, here's a fun, but mostly useless one:

setmetatable(_G, {__index = function(_, v) return v end})
debug.getmetatable('').__sub = function(s1, s2) return s1..' '..s2 end
print(hello - world)

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NI!

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Functions also have metatables, which can be interesting:
> debug.setmetatable(print, {__concat=function(a,b) return function(...) return b(a(...)) end end})
> f = string.reverse .. string.upper
> =f('hello')
OLLEH

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