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(Examples of metatables in lua 5.1)
| Date: | 06/07/07 |
| Author: | Peter Cawley |
| URL: | n/a |
| Comments: | 0 |
| Info: | http://www.lua.org/ |
| Score: |  (3.09 in 22 votes) |
phrase = "Take one down and pass it around,"
none = "No more bottles of beer"
justone = "1 bottle of beer"
bottles = setmetatable({0,
drink = {
phrase .. "\n" .. none .. " on the wall,",
"Go to the store and buy some more!"
}},{
__index = function(crate,num)
crate[num] = nil
print(crate[num] .. " on the wall,")
print(crate[num] .. ",")
print(phrase)
crate[num] = crate[num-1]
return justone .. " on the wall,\n"
end, __newindex = function(crate,num,drink)
rawset(crate,num,drink or (num .. " bottles of beer"))
if rawget(crate,num+1) then
print(crate[num] .. " on the wall,\n")
end
end, __call = function()
return ipairs{justone, none}
end}
)
print(bottles[99])
for it, beer in bottles() do
print(beer .. " on the wall,")
print(beer .. ",")
print(bottles.drink[it])
print ""
end
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Alternative Versions
| Version | Author | Date | Comments | Rate |
|---|---|---|---|---|
| original version | Philippe Lhoste | 04/20/05 | 1 | |
| 5.1, bottled | Peter Cawley | 04/19/09 | 0 | |
| version 5.x | chill | 07/10/05 | 2 | |
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