In this article, we’ll cover the basics of the Lua programming language, including:
- What it is
- Main components
- Key features
- Pros & cons
- Use cases
- Lua vs other languages
- Installing Lua in a Windows environment
- Getting it up and running
Let’s get started.
What is Lua?
Lua is a robust, lightweight, and embeddable scripting language that supports multiple programming methods, including procedural, object-oriented, functional, and data-driven programming.
As the primary focus on Lua is for scripting, it is rarely used as a standalone programming language. Instead, it is used as a scripting language that can be integrated (embedded) into other programs written in mainly C and C++. It also supports other programming languages via third-party plugins (NLua/KeraLua for .NET/C#).
Popular use cases for Lua include:
- As a popular component in video game and game engine development. For example, Warframe, World of Warcraft, and CRYENGINE all use Lua.
- As a programming language in many network programs, like CISCO Systems, Nmap, and ModSecurity.
- As a programming language in industrial programs such as Adobe Lightroom and MySQL Workbench.
- As a library that developers can integrate with their programs to enable scripting functionality.
Being a scripting language, Lua does not have its own main application. Instead, it acts exclusively as an embedded part of the host application.
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How Lua works
There are two main components of Lua:
- The Lua interpreter
- The Lua virtual machine (VM)
Lua is not directly interpreted through a Lua file like other languages such as Python. Instead, it uses the Lua interpreter to compile a Lua file to bytecode. The Lua interpreter is written in ANSI C, making it highly portable and capable of running on a multitude of devices.
Usually, the compilation is done at the runtime. However, sometimes it can be done before the runtime to increase load times. Then the Lua virtual machine will run this compiled bytecode. The register-based architecture of the Lua virtual machine closely resembles actual hardware architectures, and it will increase the overall performance of the program.
