RE: if-in statement
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- Subject: RE: if-in statement
- From: "Jerome Vuarand" <jerome.vuarand@...>
- Date: 2007年11月12日 16:28:23 -0500
Asko Kauppi wrote:
> Alexandr Leykin kirjoitti 11.11.2007 kello 22:18:
>> How in the Lua create small "if-in" statement e.g.
>>
>> if method in ('HEAD','GET','POST') then ...
>>
>> now it's see:
>>
>> if method =='HEAD' or method=='GET' or method=='POST' then ...
>
> > method="GET"
> > if ({ HEAD=true, GET=true, POST=true }) [method] then print "Hey!"
>
> The extra parentheses are required for a syntactic reason.
You can create a simple 'in' function:
function In(t)
local s = {}
for _,v in pairs(t) do
s[v] = true
end
return function(value)
return s[value] or false
end
end
if In {'HEAD','GET','POST'} (method) then
dosomething()
end
You can't use all lowercase 'in' since it's a Lua keyword.
Also your original syntax could be supported with a token filter.