Created
July 29, 2012 09:26
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quick lua implementation of "random" UUID
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local random = math.random | |
local function uuid() | |
local template ='xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx' | |
return string.gsub(template, '[xy]', function (c) | |
local v = (c == 'x') and random(0, 0xf) or random(8, 0xb) | |
return string.format('%x', v) | |
end) | |
end |
And there it is! FTR, and as stated here, as soon as I wrapped all the string.gsub part into parenthesis, only the UUID is returned by the main function an everything seems to work as expected, cool! Thankfully, in Lua the simple addition of some parenthesis here or there is usually enough to save the day :)
You can try this:
return {string.format('%x', v)}[1]
You just wrap it into a table and then index the first object in that table.
Alternate solution without an auxiliary table: replace in the top function
return string.gsub(...)
with
local ans = string.gsub(...)
return ans
The first return value of string.gsub
is assigned to ans
, the others are ignored
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And there it is! FTR, and as stated here, as soon as I wrapped all the string.gsub part into parenthesis, only the UUID is returned by the main function an everything seems to work as expected, cool! Thankfully, in Lua the simple addition of some parenthesis here or there is usually enough to save the day :)