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prafulliu/readOnlyTables.lua

Created December 18, 2012 07:16
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read-only tables in lua.
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readOnlyTables.lua
function readOnly( t )
local proxy = {}
local mt = {
__index = t,
__newindex = function ( t, k, v )
error("attempt to update a read-only table", 2)
end
}
setmetatable(proxy, mt)
return proxy
end
days = readOnly{"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday"}
print(days[1])
days[2] = "Noday"
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