Lua
 | |
| Paradigm | Multi-paradigm: scripting, imperative (procedural, prototype-based, object-oriented), functional |
|---|---|
| Designed by | Roberto Ierusalimschy[1] Waldemar Celes[1] Luiz Henrique de Figueiredo[1] |
| First appeared | 1993[2] |
| Stable release | 5.4.7[3]  / 25 June 2024 |
| Typing discipline | dynamic, strong, duck |
| Implementation language | ANSI C |
| OS | Cross-platform |
| License | MIT License[4] |
| Website | www |
| Major implementations | |
| Lua, LuaJIT, LLVM-Lua, Lua Alchemy Luvit | |
| Dialects | |
| Metalua, Idle, GSL Shell Luau | |
| Influenced by | |
| C++, CLU, Modula, Scheme, SNOBOL | |
| Influenced | |
| Io, GameMonkey, Squirrel, Falcon, MiniD | |
Lua is an open source programming language.[2] It was created in 1993 by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, and Waldemar Celes.[1] Lua is used for many different things, especially in video games such as World of Warcraft, SimCity 4 and Transformice.[5] It is also used in the popular virtual world sharing website Roblox under a dialect called Luau.[6] In June 2010, Apple Inc. changed the terms of use for the software development kit of its iOS operating system to allow the use of Lua.[7] This led to Lua being used to make iPhone applications such as Angry Birds. In June 2011, Lua was ranked the tenth most popular programming language by the TIOBE Index.[8]
History
[change | change source]Lua was created in 1993 by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, and Waldemar Celes. They are members of the Computers Graphics Technology Group (Tecgraf) at the Pontifical Catholic University of Rio de Janerio.
From 1977 until 1992, Brazil had strong trade barriers for computer hardware and software; these barriers were called a market reserve. At the time, clients of Tecgraf could not afford software from abroad. They would have to go through a complicated process to prove their needs could not be met by Brazilian companies. This caused Tecgraf to implement its needed tools from scratch.[9][10]
Lua followed SOL (Simple Object Language) and DEL (data-entry language). They are computer languages that described and managed data. They had been independently developed at Tecgraf for two different projects. These projects were for engineering applications for the Petrobras company. Petrobras later wanted more power in SOL and DEL. They lacked functions to control flow.
Lua’s syntax for control flow was mostly borrowed from Modula. It also taken influence from other programming languages: CLU for multiple inputs and outputs from calling functions, C++ for local variables, and SNOBAL and AWK for associative arrays. LISP and Scheme also influenced the focus on tables. These two languages used a single structure mechanism.[11]
Examples
[change | change source]An example Hello World program in Lua:
-- !/usr/bin/lua
print("Hello World!")
An example of setting a value, then printing it:
--!/usr/bin/lua
a = "Hello World!"
print(a)
An example of a function, then using it:
--!/usr/bin/lua
local function TestFunction()
print("Hello World!")
end
TestFunction()
An example of a loop that prints each entry in the list in order:
--!/usr/bin/lua
local list = {"Hey","my","name","is","Dan"}
for i, v in pairs(list) do
print(v)
end
References
[change | change source]- ↑ 1.0 1.1 1.2 1.3 Ierusalimschy, R.; Figueiredo, L. H.; Celes, W. (2007). "The evolution of Lua" (PDF). Proc. of ACM HOPL III. pp. 2–1–2–26. doi:10.1145/1238844.1238846. ISBN 978-1-59593-766-7. S2CID 475143.
- ↑ 2.0 2.1 "Lua: About". Lua.org. Retrieved 28 February 2011.
- ↑ "[ANN] Lua 5.4.7 now available". 25 June 2024. Retrieved 27 June 2024.
- ↑ "Lua: license". Lua.org. Retrieved 6 April 2011.
- ↑ "Lua Uses". lua-users wiki. Archived from the original on 24 November 2010. Retrieved 16 February 2011.
- ↑ "Luau". Luau. Archived from the original on 2021-04-08. Retrieved 2021-04-07.
- ↑ "Apple relaxes iOS SDK terms to allow Lua but block Flash". Appleinsider.com. 11 June 2010. Retrieved 11 June 2011.
- ↑ "TIOBE Programming Community Index for June 2011". TIOBE Software. June 2011. Archived from the original on 2 July 2013. Retrieved 11 June 2011.
- ↑ "The evolution of an extension language: a history of Lua". 2001. Retrieved 2008-12-18.
- ↑ Ierusalimschy, R.; Figueiredo, L. H.; Celes, W. (2007). "The evolution of Lua" (PDF). Proceedings of the third ACM SIGPLAN conference on History of programming languages. pp. 2–1–2–26. doi:10.1145/1238844.1238846. ISBN 978-1-59593-766-7. S2CID 475143.[dead link]
- ↑ Figueiredo, L. H.; Ierusalimschy, R.; Celes, W. (December 1996). "Lua: an Extensible Embedded Language. A few metamechanisms replace a host of features". Dr. Dobb's Journal. Vol. 21, no. 12. pp. 26–33.
Other websites
[change | change source]- Lua.org
- lua-users.org Archived 2010-12-16 at the Wayback Machine
