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Lua

Lua. By: Michael Coffman Peter Sussman. History. Lua means ‘moon’ in Portuguese First appeared in 1993 Created by Roberto Ierusalimschy , Luiz Henrique de Figueiredo , and Waldemar Celes at Pontifical Catholic University of Rio de Janeiro in Brazil

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Lua

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  1. Lua By: Michael Coffman Peter Sussman

  2. History • Lua means ‘moon’ in Portuguese • First appeared in 1993 • Created by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, and WaldemarCeles at Pontifical Catholic University of Rio de Janeiro in Brazil • Developed because Brazil had a strong policy against foreign trade • Primary influence: c++

  3. Features • Light, multi-paradigm language • Highly portable: can be compiled to run on Linux, Windows, Macintosh • Very small: complete language occupies less than 1 megabyte • Dynamically typed; eight types, boolean, number, string, nil, function, userdata, thread, table • Also has automatic garbage collection

  4. Features • Only data structure is the table, which can be used to implement arrays, lists, etc. • Can run code in pure interpretation or intermediate byte code (such as Java) • Can call functions written in C or Lua • Arrays do not have to be only one type • Variables are global unless otherwise declared

  5. Code Samples

  6. Code Samples

  7. Code Samples

  8. Sample Runs

  9. Sample Runs

  10. Readability • Pros • Functions are well defined and easy to follow • Similar to C syntax • Very little parentheses or brackets • Cons • Most blocks of code end in ‘end’ • No spaces between terminals and nonterminals • Variables don’t have declared types, only their values do

  11. Writability • Pros • Few keywords • All blocks of code end with ‘end’ • Syntax similar to C • Cons • All blocks of code end with ‘end’ • Limited data types

  12. Reliability • Pros • One of the most reliable languages on the market • Cons • Easy to get lost in the nested ‘end’ statements leading to programming errors

  13. Cost • Pros • Free • Small and portable: Lua can be used from a USB drive from one machine to the next, and across multiple OS’s • Cons • Lua is not considered a mainstream language, so training might cost a fair amount

  14. Who Uses Lua • Blizzard Entertainment: World of Warcraft scripting • Cisco Systems • Maxis/EA: SimCity 4 • Adobe: Adobe Photoshop Lightroom • Many video games use Lua

  15. References • http://www.lua.org/ • http://en.wikipedia.org/wiki/Lua_(programming_language)

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