Lua course

lua

Lua Is a lightweight and compact scripting language , Use standard C Language and open in the form of source code , It is designed to be embedded in the application , So as to provide flexible extension and customization functions for applications .

Lua It's the Catholic University of Rio de Janeiro, Brazil (Pontifical Catholic University of Rio de Janeiro) A research group in 1993 Developed in , The members of the group are :Roberto Ierusalimschy、Waldemar Celes and Luiz Henrique de Figueiredo.


Design purpose

It is designed to be embedded in the application , So as to provide flexible extension and customization functions for applications .


Lua characteristic

  • Lightweight : It uses standard C Language and open in the form of source code , After compilation, only more than 100 K, It can be easily embedded in other programs .
  • Scalable : Lua It provides a very easy-to-use extension interface and mechanism : By the host language ( Usually C Or C++) Provide these functions ,Lua You can use them , It's like a built-in function .
  • Other features :
    • Support process oriented (procedure-oriented) Programming and functional programming (functional programming);
    • Automatic memory management ; Only one common type of table is provided (table), It can be used to realize array , Hash table , aggregate , Object ;
    • Language built-in pattern matching ; closure (closure); Function can also be regarded as a value ; Provides multithreading ( Collaborative processes , Not a thread supported by the operating system ) support ;
    • Through closures and table It can easily support some key mechanisms required by object-oriented programming , Such as data abstraction , Virtual functions , Inheritance and overloading .

Lua Application scenario

  • Game development
  • Independent application script
  • Web Application script
  • Extensions and database plug-ins such as :MySQL Proxy and MySQL WorkBench
  • safety system , Such as intrusion detection system

first Lua Program

Next we use Lua To output "Hello World!"

example (Lua 5.3)

print ( "Hello World!" )

Run instance »

After operation , Will be displayed on the screen Hello, world!.