Metatable

A Metatable is a table of functions that controls how a different table acts in a Roblox place. For example, if one wanted to create a table with numbers and math functions while leaving the table intact, this function would be the solution to said problem.

Metamethods

A metamethod is a method called when an object or entity attempts to affect the table. They allow for easy manipulation of the table.

Metamethod	Description
__index(table, index)	Fired upon: table[index], when table[index] is nil
__newindex(table, index, value)	Fired upon: table[index] = value, when table[index] is nil
__iter(table)	Fired upon iterating a table, must return an iterator function (such as next) and at least 1 parameter for it
__call(table, ...)	Fired upon: table(...), where ... are the arguments passed
__concat(table, value)	Fired upon: table .. value
__unm(table)	Fired upon: -table
__add(table, value)	Fired upon: table + value
__sub(table, value)	Fired upon: table - value
__mul(table, value)	Fired upon: table * value
__div(table, value)	Fired upon: table / value
__idiv(table, value)	Fired upon: table // value
__mod(table, value)	Fired upon: table % value
__pow(table, value)	Fired upon: table ^ value
__tostring(table)	Fired upon: tostring(table)
__metatable	Allows a custom return value upon the getmetatable() function
__eq(table, value)	Fired upon: table == value
__lt(table, value)	Fired upon: table < value, Opposite fired upon: table >= value
__le(table, value)	Fired upon: table <= value, Opposite fired upon: table > value
__mode	Used to declare weak keys/values
__gc(table)	Fired upon: collectgarbage(table)
__len(table)	Fired upon: #table

External links

• Metatables on Roblox Creator Documentation