What is a Metamethod in 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 is a Metamethod?

Metatables allow tables to become more powerful than before. They are attached to data and contain values called metamethods. Metamethods are fired when a certain action is used with the datum that it is attached to.

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 __ Namecall?

__namecall is a Roblox specific metamethod that’s used exclusively on Instances. You can only use it by adding it to a userdata (with newproxy(true) ), and, it doesn’t give you any information about the actual call, that information is only accessible from C code.

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 Lua Pcall?

Lua Error Handling Using pcall pcall stands for “protected call”. It is used to add error handling to functions. pcall works similar as try-catch in other languages. The advantage of pcall is that the whole execution of the script is not being interrupted if errors occur in functions called with pcall .

How do you create a table in Lua?

In Lua the table is created by {} as table = {}, which create an empty table or with elements to create non-empty table. After creating a table an element can be add as key-value pair as table1[key]= “value”.

What is Userdata?

That means disclosing your app’s access, collection, use, and sharing of the data, and limiting the use of the data to the purposes disclosed. …

Whats is Userdata?

Any data the user creates or owns. The term user data may be used to emphasize that the data were created and owned by the user. For example, when deleting an application, an uninstall program may ask if user data is also to be deleted. See user and data.

What is a Pcall function?

The pcall function calls its first argument in protected mode, so that it catches any errors while the function is running. If there are no errors, pcall returns true, plus any values returned by the call. Otherwise, it returns false, plus the error message.

What is Pcall function Roblox?

pcall is short for protected call. It is used for calling functions that may possibly error so that it does not stop the script and we can handle it manually. A good example of this are DataStores, which allow us to save data.

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