collectgarbage ([opt [, arg]]) This function is a generic interface to the garbage collector. It performs different functions according to its first argument, opt:

pairs (t) If t has a metamethod __pairs, calls it with t as argument and returns the first three results from the call. Otherwise

select (index, ···) If index is a number, returns all arguments after argument number index; a negative number indexes from the end (-1 is the last argument)

rawequal (v1, v2)v1v2__eq

xpcall (f, msgh [, arg1, ···]) This function is similar to pcall, except

rawset (table, index, value)table[index]value__newindextableindexnilvalue This function returns

setmetatable (table, metatable) Sets the metatable for the given table. (To change the metatable of other types from Lua code, you must use the debug library (

assert (v [, message]) Calls error if the value of its argument v

type (v)nilnilnumberstringbooleantablefunctionthreaduserdata

tostring (v)string.format If the metatable of v