oop - Regarding colon operator in Lua -

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why piece of code fail (attempt call method 'sort' (a nil value))

th> xyz = {1,2,3}                                                                       th> xyz:sort()

while works

th> table.sort(xyz)

because table table, contains generic functions manipulating tables provided standard library, isn't in metatable table default. in fact, table doesn't have metatable unless specified explicitly.

you manually though:

local xyz = {1,2,3} local mt = { __index = table} setmetatable(xyz, mt) xyz:insert(2) xyz:sort()

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