Lua Unofficial FAQ u. FAQMaintainer Steve Donovan steve j donovan at gmail com, 2. Creative Commons License Reproduction in any form is permitted as long as this attribution is kept. Language. 1. 1 Where to start The official lua. FAQ is here, which is the place to go for essential information like Lua availability and licensing issues. There is also an incomplete Lua Wiki FAQ this unofficial FAQ aims to fill in the holes and answer as many questions as possible, in a useful way. In todays post I will discuss on steps you should doneed for Oracle Apps R12 installation. Most of these steps are written w. Installation on Linux but I. Get the free oracle vision instance for practice the front end. Instant1.jpg' alt='J2se Plugin Version 1.6 0 07' title='J2se Plugin Version 1.6 0 07' />Lua is a modern dynamic language with conventional syntax function sqrx. Although at first glance it looks like Basic, Lua is more akin to Java. Script such as no explicit class mechanism and equivalence of ax with a. There are very few types string, number, table, function, thread and userdata. This simplicity accounts for a lot of Luas speed and compactness compared with languages of equivalent power. The Lua Users Wiki is full of useful example source and thoughtful discussion. In particular, here is a good place to start learning Lua. The definitive book is Programming in Lua by Roberto Ierusalimschy, who is one of the creators of Lua. If you are coming to Lua from another programming language, then see the list of common gotchas. And of course, read the manual, although this is probably not a good place to start. Suitability as a first programming language Lua is a compact language with a clean, conventional syntax which is easy to read. This makes it a good choice for embedding as a scripting language in larger applications, but also is suitable for introducing programming concepts. Driver Via/S3g Unichrome Pro Igp Windows 8 on this page. Functions are first class values and may be anonymous, so that functional styles can be learned. Proper closures and tail call recursion are supported. It runs interactively so exploring the language and its libraries is easy. Some comparisons with other languages can be found on the Lua Wiki. Suitability as a second programming languageIn this tutorial, we will show you how to use create a Java project with Maven, imports it into the Eclipse IDE, and package the Java project into a jar file. In a. One scenario is that you already have big CCJavaC etc applications and wish to let your users script those applications. Lua will only add about 1. K, which gets you a modern extension language which understands your special needs like sand boxing and can be easily integrated with your code. The other is that you have a lot of components which you use in your work flow and you are looking for a glue language to easily bind them together quickly without messy recompilation. See Ousterhouts Dichotomy. Another powerful use case which combines these two is embedding Lua as a aid to debugging. It is possible to provide an intelligent debug console even for GUI applications, such as JavaSwing running Lua, which can let you operate inside an application, querying state and running little test scripts. Any good editors and debuggers See Lua. Editor. Support. Basically any of the common ones, including XCode. Sci. TE is a popular editor for Windows and GTK platforms which has good Lua support. The version that ships with Lua for Windows can also debug Lua code. In addition, it is scriptable using its own embedded Lua interpreter. There is a Lua plugin for Intelli. J IDEA. 1. 5 Lua seems very verbose. Why isnt it like C The compactness of C and the Unix environment in which it grew up comes from the technical limitations of very clunky teleprinters. Now we have tab completion and smart editors which can do abbreviations, so it doesnt really take more time to type Lua than C. For example, in Sci. TE one can add this to the abbreviations file if if then n. Typing if followed by ctrl B will then put out the expanded text, properly indented. Another point is that we spend much more time reading code than writing code, so the question is really whether it reads well. C is very readable to someone who is used to reading C, but Lua is more readable for casual programmers. A C like Lua derivative is Squirrel. There is one important sense that Lua is the C of dynamic languages it is small, fast, and only comes with the essential batteries. This is more than an analogy, since the Lua implementation only uses what is available with the C8. Why do Lua arrays count from oneOddly, the thing that really gets some people overexcited is that in Lua array indices count from one. In mathematical notation array indices count from one, and so does Lua. In other words, they are not offsets. The historical reason see The Evolution of Lua is that Lua evolved to solve engineering needs at the Brazillian state oil company Petrobras. It was designed for engineers who were not professional programmers and more likely to be used to FORTRAN. You can make your arrays start with zero, but the standard library functions such as table. And will return the size minus one. Can I use a conditional expression like x C The Lua form is res x and y or b which works because the value of these operators is not just a boolean value, but is their second operand. Proper short circuiting takes place, that is the expression b will not be evaluated if the condition was true. But please note the case where y is either nil or false. The first and fails and we pick up b anyway. Multiple values are understood print false and 5 or 1. People will often write a convenience function function choosecond,a,b. This evaluates both values first, so it is suitable only for simple values, but it is bulletproof. How can undefined variable access be caught in Lua By default, an unknown variable is looked up in the global or module table and its value will be nil. This is a valid value for a variable, so mistyping a variable name can have interesting results, even if we were avoiding using globals like good boys and girls. There are several approaches for enforcing some strictness with globals. The easiest is to check dynamically whether a given global variable has been initialised explicitly or not that is, even if it has been set to nil somewhere see strict. Lua distribution. The testsglobals. In particular, there are global functions and tables provided by the standard libraries. Lua. Inspect provides real time source code analysis for Lua using a Sci. TEhttp www. Sci. TE. HTML is supported. This provides semantic highlighting for Lua, so that for instance local variables are marked and can be visited, and unknown globals are flagged in red. Does Lua support Unicode Yes and No. Lua strings can contain any characters they are not NUL terminated so Unicode strings can be passed around without problems, as can any binary data. However, the existing string libraries assume single byte characters, so a special library is needed see slnunicode or ICU4. Lua. 1. 8 Optimization tips The first question is, do you actually have a problem Is the program not fast enough Remember the three basic requirements of a system Correct, Robust and Efficient, and the engineering rule of thumb that you may have to pick only two. Donald Knuth is often quoted about optimisation If you optimise everything, you will always be unhappy and we should forget about small efficiencies, say about 9. Assume a program is correct and hopefully robust. There is a definite cost in optimising that program, both in programmer time and in code readability. If you dont know what the slow bits are, then you will waste time making your all your program ugly and maybe a little faster which is why he says you will be unhappy. So the first step is to use Lua.