Re: Arithmetic on strings
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- Subject: Re: Arithmetic on strings
- From: Hans Hagen <pragma@...>
- Date: 2012年6月13日 21:01:33 +0200
On 13-6-2012 20:14, Roberto Ierusalimschy wrote:
Concerning (2): not all types have metatables so boolean is still
somewhat of a problem then. (I can live with it.)
We can use the metatables for strings (if at least one argument is
a string)! This already works both in 5.1 and 5.2:
mt = getmetatable("")
mt.__concat = function (a,b)
return tostring(a) .. tostring(b)
end
print("result: " .. {}) --> result: table: 0x8172130
print(false .. " x " .. true) --> false x true
interesting, so what is the trick for
local t = { 1, 2, "test", true }
print(table.concat(t))
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
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- References:
- Re: Arithmetic on strings, Andrew Starks
- Re: Arithmetic on strings, steve donovan
- Re: Arithmetic on strings, liam mail
- Re: Arithmetic on strings, Andrew Starks
- Re: Arithmetic on strings, Javier Guerra Giraldez
- Re: Arithmetic on strings, Roberto Ierusalimschy
- Re: Arithmetic on strings, liam mail
- Re: Arithmetic on strings, Hans Hagen
- Re: Arithmetic on strings, Roberto Ierusalimschy
- Re: Arithmetic on strings, Hans Hagen
- Re: Arithmetic on strings, Roberto Ierusalimschy