Metatables in Lua

Faq.txt

Q1. What are metatable?
ans: Metatable are table that are used to modify the behaviour of a table.

Q2. How can we attach a metatable for particular table?
ans: In lua , we have setmetatable function which will attach a metatables for a table.

Q3. How can we use a metamethod defined in the module?
ans: we can just use the particular operator to perform the operation of the metamethod define in the metatables.

gistfile1.txt

Q1.Correct way to set a metatable for a table?
a) settable(table,metatable)
b) setmetatable(table,metatable)
a) table.settable(metatable)
b) setmetatable(metatable,table)

ans: b)

Q2.which of the following is not a metamethod :
a)__eq
b)__le
c)__ge
d)__gg

ans: d)

Q3.What is the function of __unm method?
a) + unary operator
b) - unary operator
c) .. concatenate operator
d) none of the above

ans: b)