What is a Metamethod?
Metamethods are the functions that are stored inside a metatable. They can go from. calling a table, to adding a table, to even dividing tables as well.
What is a Metamethod Lua?
A metatable is a regular Lua table containing a set of metamethods, which are associated with events in Lua. Events occur when Lua executes certain operations, like addition, string concatenation, comparisons etc. Metamethods are regular Lua functions which are called when a specific event occurs.
What are meta tables used for?
A metatable is the section of a database or other data holding structure that is designated to hold data that will act as source code or metadata. In most cases, specific software has been written to read the data from the metatables and perform different actions depending on the data it finds.
What is a meta table in Lua?
A metatable is a table that helps in modifying the behavior of a table it is attached to with the help of a key set and related meta methods. These meta methods are powerful Lua functionality that enables features like − Changing/adding functionalities to operators on tables.
What is __ Namecall?
__namecall is a metamethod which fires when you call a function of an object via : , it’s just an internal optimization.
What is self Roblox?
Assuming I have understood your post correctly, self is a Lua variable that is automatically assigned to when doing OOP related programming. In Lua there are two ways to call a method.
What is an array in Lua?
Advertisements. Arrays are ordered arrangement of objects, which may be a one-dimensional array containing a collection of rows or a multi-dimensional array containing multiple rows and columns. In Lua, arrays are implemented using indexing tables with integers.
Why does Lua count from 1?
Lua lists have a base index of 1 because it was thought to be most friendly for non-programmers, as it makes indices correspond to ordinal element positions.
What is Userdata Lua?
The Lua userdata represents arbitrary C/C++ data that can be used from within Lua. The userdata is one of the basic types in Lua, it allows arbitrary C/C++ data to be stored in Lua variables. The value of the userdata is a pointer to the block of raw memory.
What is a Roblox method?
Methods are unique functions which belong to a particular object. Some common Roblox methods include Instance:Destroy() , Instance:Clone() , and Instance:FindFirstChild() . A method acts like a function stored within an object, accessible in the same way a function within a table is accessed.
How are metamethods defined in the Lua core?
So far, all the metamethods we have seen are for the Lua core. It is the virtual machine that detects that the values involved in an operation have metatables and that these metatables define metamethods for that operation. However, because the metatable is a regular table, anyone can use it. The tostringfunction provides a typical example.
What can you do with metatables in Lua?
We cannot add tables, we cannot compare tables, and we cannot call a table. Metatables allow us to change the behavior of a table. For instance, using metatables, we can define how Lua computes the expression a+b , where a and b are tables.
What do you need to know about metamethods and events?
So, to keep it short: you can think of metamethods as events. An event fires when something happens, a metamethod invokes when something happens to the table its metatable is connected with. The __index metamethod fires /invokes when you index a table t with a value x, where x doesn’t exist. (Doing t [x] or t.x, when there isn’t an x in t).
What does the _ _ index metamethod do?
The __index metamethod gives back the table you indexed first, and the key that you indexed with second, as parameters if you wanna call them like that. (in this case, the independant table and key parameters)
https://www.youtube.com/watch?v=CYxMfVy5W00